/*! jQuery UI - v1.10.2 - 2013-04-09
* http://jqueryui.com
* Includes: jquery.ui.core.js, jquery.ui.widget.js, jquery.ui.accordion.js
* Copyright 2013 jQuery Foundation and other contributors Licensed MIT */

(function( $, undefined ) {

var uuid = 0,
	runiqueId = /^ui-id-\d+$/;

// $.ui might exist from components with no dependencies, e.g., $.ui.position
$.ui = $.ui || {};

$.extend( $.ui, {
	version: "1.10.2",

	keyCode: {
		BACKSPACE: 8,
		COMMA: 188,
		DELETE: 46,
		DOWN: 40,
		END: 35,
		ENTER: 13,
		ESCAPE: 27,
		HOME: 36,
		LEFT: 37,
		NUMPAD_ADD: 107,
		NUMPAD_DECIMAL: 110,
		NUMPAD_DIVIDE: 111,
		NUMPAD_ENTER: 108,
		NUMPAD_MULTIPLY: 106,
		NUMPAD_SUBTRACT: 109,
		PAGE_DOWN: 34,
		PAGE_UP: 33,
		PERIOD: 190,
		RIGHT: 39,
		SPACE: 32,
		TAB: 9,
		UP: 38
	}
});

// plugins
$.fn.extend({
	focus: (function( orig ) {
		return function( delay, fn ) {
			return typeof delay === "number" ?
				this.each(function() {
					var elem = this;
					setTimeout(function() {
						$( elem ).focus();
						if ( fn ) {
							fn.call( elem );
						}
					}, delay );
				}) :
				orig.apply( this, arguments );
		};
	})( $.fn.focus ),

	scrollParent: function() {
		var scrollParent;
		if (($.ui.ie && (/(static|relative)/).test(this.css("position"))) || (/absolute/).test(this.css("position"))) {
			scrollParent = this.parents().filter(function() {
				return (/(relative|absolute|fixed)/).test($.css(this,"position")) && (/(auto|scroll)/).test($.css(this,"overflow")+$.css(this,"overflow-y")+$.css(this,"overflow-x"));
			}).eq(0);
		} else {
			scrollParent = this.parents().filter(function() {
				return (/(auto|scroll)/).test($.css(this,"overflow")+$.css(this,"overflow-y")+$.css(this,"overflow-x"));
			}).eq(0);
		}

		return (/fixed/).test(this.css("position")) || !scrollParent.length ? $(document) : scrollParent;
	},

	zIndex: function( zIndex ) {
		if ( zIndex !== undefined ) {
			return this.css( "zIndex", zIndex );
		}

		if ( this.length ) {
			var elem = $( this[ 0 ] ), position, value;
			while ( elem.length && elem[ 0 ] !== document ) {
				// Ignore z-index if position is set to a value where z-index is ignored by the browser
				// This makes behavior of this function consistent across browsers
				// WebKit always returns auto if the element is positioned
				position = elem.css( "position" );
				if ( position === "absolute" || position === "relative" || position === "fixed" ) {
					// IE returns 0 when zIndex is not specified
					// other browsers return a string
					// we ignore the case of nested elements with an explicit value of 0
					// <div style="z-index: -10;"><div style="z-index: 0;"></div></div>
					value = parseInt( elem.css( "zIndex" ), 10 );
					if ( !isNaN( value ) && value !== 0 ) {
						return value;
					}
				}
				elem = elem.parent();
			}
		}

		return 0;
	},

	uniqueId: function() {
		return this.each(function() {
			if ( !this.id ) {
				this.id = "ui-id-" + (++uuid);
			}
		});
	},

	removeUniqueId: function() {
		return this.each(function() {
			if ( runiqueId.test( this.id ) ) {
				$( this ).removeAttr( "id" );
			}
		});
	}
});

// selectors
function focusable( element, isTabIndexNotNaN ) {
	var map, mapName, img,
		nodeName = element.nodeName.toLowerCase();
	if ( "area" === nodeName ) {
		map = element.parentNode;
		mapName = map.name;
		if ( !element.href || !mapName || map.nodeName.toLowerCase() !== "map" ) {
			return false;
		}
		img = $( "img[usemap=#" + mapName + "]" )[0];
		return !!img && visible( img );
	}
	return ( /input|select|textarea|button|object/.test( nodeName ) ?
		!element.disabled :
		"a" === nodeName ?
			element.href || isTabIndexNotNaN :
			isTabIndexNotNaN) &&
		// the element and all of its ancestors must be visible
		visible( element );
}

function visible( element ) {
	return $.expr.filters.visible( element ) &&
		!$( element ).parents().addBack().filter(function() {
			return $.css( this, "visibility" ) === "hidden";
		}).length;
}

$.extend( $.expr[ ":" ], {
	data: $.expr.createPseudo ?
		$.expr.createPseudo(function( dataName ) {
			return function( elem ) {
				return !!$.data( elem, dataName );
			};
		}) :
		// support: jQuery <1.8
		function( elem, i, match ) {
			return !!$.data( elem, match[ 3 ] );
		},

	focusable: function( element ) {
		return focusable( element, !isNaN( $.attr( element, "tabindex" ) ) );
	},

	tabbable: function( element ) {
		var tabIndex = $.attr( element, "tabindex" ),
			isTabIndexNaN = isNaN( tabIndex );
		return ( isTabIndexNaN || tabIndex >= 0 ) && focusable( element, !isTabIndexNaN );
	}
});

// support: jQuery <1.8
if ( !$( "<a>" ).outerWidth( 1 ).jquery ) {
	$.each( [ "Width", "Height" ], function( i, name ) {
		var side = name === "Width" ? [ "Left", "Right" ] : [ "Top", "Bottom" ],
			type = name.toLowerCase(),
			orig = {
				innerWidth: $.fn.innerWidth,
				innerHeight: $.fn.innerHeight,
				outerWidth: $.fn.outerWidth,
				outerHeight: $.fn.outerHeight
			};

		function reduce( elem, size, border, margin ) {
			$.each( side, function() {
				size -= parseFloat( $.css( elem, "padding" + this ) ) || 0;
				if ( border ) {
					size -= parseFloat( $.css( elem, "border" + this + "Width" ) ) || 0;
				}
				if ( margin ) {
					size -= parseFloat( $.css( elem, "margin" + this ) ) || 0;
				}
			});
			return size;
		}

		$.fn[ "inner" + name ] = function( size ) {
			if ( size === undefined ) {
				return orig[ "inner" + name ].call( this );
			}

			return this.each(function() {
				$( this ).css( type, reduce( this, size ) + "px" );
			});
		};

		$.fn[ "outer" + name] = function( size, margin ) {
			if ( typeof size !== "number" ) {
				return orig[ "outer" + name ].call( this, size );
			}

			return this.each(function() {
				$( this).css( type, reduce( this, size, true, margin ) + "px" );
			});
		};
	});
}

// support: jQuery <1.8
if ( !$.fn.addBack ) {
	$.fn.addBack = function( selector ) {
		return this.add( selector == null ?
			this.prevObject : this.prevObject.filter( selector )
		);
	};
}

// support: jQuery 1.6.1, 1.6.2 (http://bugs.jquery.com/ticket/9413)
if ( $( "<a>" ).data( "a-b", "a" ).removeData( "a-b" ).data( "a-b" ) ) {
	$.fn.removeData = (function( removeData ) {
		return function( key ) {
			if ( arguments.length ) {
				return removeData.call( this, $.camelCase( key ) );
			} else {
				return removeData.call( this );
			}
		};
	})( $.fn.removeData );
}





// deprecated
$.ui.ie = !!/msie [\w.]+/.exec( navigator.userAgent.toLowerCase() );

$.support.selectstart = "onselectstart" in document.createElement( "div" );
$.fn.extend({
	disableSelection: function() {
		return this.bind( ( $.support.selectstart ? "selectstart" : "mousedown" ) +
			".ui-disableSelection", function( event ) {
				event.preventDefault();
			});
	},

	enableSelection: function() {
		return this.unbind( ".ui-disableSelection" );
	}
});

$.extend( $.ui, {
	// $.ui.plugin is deprecated.  Use the proxy pattern instead.
	plugin: {
		add: function( module, option, set ) {
			var i,
				proto = $.ui[ module ].prototype;
			for ( i in set ) {
				proto.plugins[ i ] = proto.plugins[ i ] || [];
				proto.plugins[ i ].push( [ option, set[ i ] ] );
			}
		},
		call: function( instance, name, args ) {
			var i,
				set = instance.plugins[ name ];
			if ( !set || !instance.element[ 0 ].parentNode || instance.element[ 0 ].parentNode.nodeType === 11 ) {
				return;
			}

			for ( i = 0; i < set.length; i++ ) {
				if ( instance.options[ set[ i ][ 0 ] ] ) {
					set[ i ][ 1 ].apply( instance.element, args );
				}
			}
		}
	},

	// only used by resizable
	hasScroll: function( el, a ) {

		//If overflow is hidden, the element might have extra content, but the user wants to hide it
		if ( $( el ).css( "overflow" ) === "hidden") {
			return false;
		}

		var scroll = ( a && a === "left" ) ? "scrollLeft" : "scrollTop",
			has = false;

		if ( el[ scroll ] > 0 ) {
			return true;
		}

		// TODO: determine which cases actually cause this to happen
		// if the element doesn't have the scroll set, see if it's possible to
		// set the scroll
		el[ scroll ] = 1;
		has = ( el[ scroll ] > 0 );
		el[ scroll ] = 0;
		return has;
	}
});

})( jQuery );
(function( $, undefined ) {

var uuid = 0,
	slice = Array.prototype.slice,
	_cleanData = $.cleanData;
$.cleanData = function( elems ) {
	for ( var i = 0, elem; (elem = elems[i]) != null; i++ ) {
		try {
			$( elem ).triggerHandler( "remove" );
		// http://bugs.jquery.com/ticket/8235
		} catch( e ) {}
	}
	_cleanData( elems );
};

$.widget = function( name, base, prototype ) {
	var fullName, existingConstructor, constructor, basePrototype,
		// proxiedPrototype allows the provided prototype to remain unmodified
		// so that it can be used as a mixin for multiple widgets (#8876)
		proxiedPrototype = {},
		namespace = name.split( "." )[ 0 ];

	name = name.split( "." )[ 1 ];
	fullName = namespace + "-" + name;

	if ( !prototype ) {
		prototype = base;
		base = $.Widget;
	}

	// create selector for plugin
	$.expr[ ":" ][ fullName.toLowerCase() ] = function( elem ) {
		return !!$.data( elem, fullName );
	};

	$[ namespace ] = $[ namespace ] || {};
	existingConstructor = $[ namespace ][ name ];
	constructor = $[ namespace ][ name ] = function( options, element ) {
		// allow instantiation without "new" keyword
		if ( !this._createWidget ) {
			return new constructor( options, element );
		}

		// allow instantiation without initializing for simple inheritance
		// must use "new" keyword (the code above always passes args)
		if ( arguments.length ) {
			this._createWidget( options, element );
		}
	};
	// extend with the existing constructor to carry over any static properties
	$.extend( constructor, existingConstructor, {
		version: prototype.version,
		// copy the object used to create the prototype in case we need to
		// redefine the widget later
		_proto: $.extend( {}, prototype ),
		// track widgets that inherit from this widget in case this widget is
		// redefined after a widget inherits from it
		_childConstructors: []
	});

	basePrototype = new base();
	// we need to make the options hash a property directly on the new instance
	// otherwise we'll modify the options hash on the prototype that we're
	// inheriting from
	basePrototype.options = $.widget.extend( {}, basePrototype.options );
	$.each( prototype, function( prop, value ) {
		if ( !$.isFunction( value ) ) {
			proxiedPrototype[ prop ] = value;
			return;
		}
		proxiedPrototype[ prop ] = (function() {
			var _super = function() {
					return base.prototype[ prop ].apply( this, arguments );
				},
				_superApply = function( args ) {
					return base.prototype[ prop ].apply( this, args );
				};
			return function() {
				var __super = this._super,
					__superApply = this._superApply,
					returnValue;

				this._super = _super;
				this._superApply = _superApply;

				returnValue = value.apply( this, arguments );

				this._super = __super;
				this._superApply = __superApply;

				return returnValue;
			};
		})();
	});
	constructor.prototype = $.widget.extend( basePrototype, {
		// TODO: remove support for widgetEventPrefix
		// always use the name + a colon as the prefix, e.g., draggable:start
		// don't prefix for widgets that aren't DOM-based
		widgetEventPrefix: existingConstructor ? basePrototype.widgetEventPrefix : name
	}, proxiedPrototype, {
		constructor: constructor,
		namespace: namespace,
		widgetName: name,
		widgetFullName: fullName
	});

	// If this widget is being redefined then we need to find all widgets that
	// are inheriting from it and redefine all of them so that they inherit from
	// the new version of this widget. We're essentially trying to replace one
	// level in the prototype chain.
	if ( existingConstructor ) {
		$.each( existingConstructor._childConstructors, function( i, child ) {
			var childPrototype = child.prototype;

			// redefine the child widget using the same prototype that was
			// originally used, but inherit from the new version of the base
			$.widget( childPrototype.namespace + "." + childPrototype.widgetName, constructor, child._proto );
		});
		// remove the list of existing child constructors from the old constructor
		// so the old child constructors can be garbage collected
		delete existingConstructor._childConstructors;
	} else {
		base._childConstructors.push( constructor );
	}

	$.widget.bridge( name, constructor );
};

$.widget.extend = function( target ) {
	var input = slice.call( arguments, 1 ),
		inputIndex = 0,
		inputLength = input.length,
		key,
		value;
	for ( ; inputIndex < inputLength; inputIndex++ ) {
		for ( key in input[ inputIndex ] ) {
			value = input[ inputIndex ][ key ];
			if ( input[ inputIndex ].hasOwnProperty( key ) && value !== undefined ) {
				// Clone objects
				if ( $.isPlainObject( value ) ) {
					target[ key ] = $.isPlainObject( target[ key ] ) ?
						$.widget.extend( {}, target[ key ], value ) :
						// Don't extend strings, arrays, etc. with objects
						$.widget.extend( {}, value );
				// Copy everything else by reference
				} else {
					target[ key ] = value;
				}
			}
		}
	}
	return target;
};

$.widget.bridge = function( name, object ) {
	var fullName = object.prototype.widgetFullName || name;
	$.fn[ name ] = function( options ) {
		var isMethodCall = typeof options === "string",
			args = slice.call( arguments, 1 ),
			returnValue = this;

		// allow multiple hashes to be passed on init
		options = !isMethodCall && args.length ?
			$.widget.extend.apply( null, [ options ].concat(args) ) :
			options;

		if ( isMethodCall ) {
			this.each(function() {
				var methodValue,
					instance = $.data( this, fullName );
				if ( !instance ) {
					return $.error( "cannot call methods on " + name + " prior to initialization; " +
						"attempted to call method '" + options + "'" );
				}
				if ( !$.isFunction( instance[options] ) || options.charAt( 0 ) === "_" ) {
					return $.error( "no such method '" + options + "' for " + name + " widget instance" );
				}
				methodValue = instance[ options ].apply( instance, args );
				if ( methodValue !== instance && methodValue !== undefined ) {
					returnValue = methodValue && methodValue.jquery ?
						returnValue.pushStack( methodValue.get() ) :
						methodValue;
					return false;
				}
			});
		} else {
			this.each(function() {
				var instance = $.data( this, fullName );
				if ( instance ) {
					instance.option( options || {} )._init();
				} else {
					$.data( this, fullName, new object( options, this ) );
				}
			});
		}

		return returnValue;
	};
};

$.Widget = function( /* options, element */ ) {};
$.Widget._childConstructors = [];

$.Widget.prototype = {
	widgetName: "widget",
	widgetEventPrefix: "",
	defaultElement: "<div>",
	options: {
		disabled: false,

		// callbacks
		create: null
	},
	_createWidget: function( options, element ) {
		element = $( element || this.defaultElement || this )[ 0 ];
		this.element = $( element );
		this.uuid = uuid++;
		this.eventNamespace = "." + this.widgetName + this.uuid;
		this.options = $.widget.extend( {},
			this.options,
			this._getCreateOptions(),
			options );

		this.bindings = $();
		this.hoverable = $();
		this.focusable = $();

		if ( element !== this ) {
			$.data( element, this.widgetFullName, this );
			this._on( true, this.element, {
				remove: function( event ) {
					if ( event.target === element ) {
						this.destroy();
					}
				}
			});
			this.document = $( element.style ?
				// element within the document
				element.ownerDocument :
				// element is window or document
				element.document || element );
			this.window = $( this.document[0].defaultView || this.document[0].parentWindow );
		}

		this._create();
		this._trigger( "create", null, this._getCreateEventData() );
		this._init();
	},
	_getCreateOptions: $.noop,
	_getCreateEventData: $.noop,
	_create: $.noop,
	_init: $.noop,

	destroy: function() {
		this._destroy();
		// we can probably remove the unbind calls in 2.0
		// all event bindings should go through this._on()
		this.element
			.unbind( this.eventNamespace )
			// 1.9 BC for #7810
			// TODO remove dual storage
			.removeData( this.widgetName )
			.removeData( this.widgetFullName )
			// support: jquery <1.6.3
			// http://bugs.jquery.com/ticket/9413
			.removeData( $.camelCase( this.widgetFullName ) );
		this.widget()
			.unbind( this.eventNamespace )
			.removeAttr( "aria-disabled" )
			.removeClass(
				this.widgetFullName + "-disabled " +
				"ui-state-disabled" );

		// clean up events and states
		this.bindings.unbind( this.eventNamespace );
		this.hoverable.removeClass( "ui-state-hover" );
		this.focusable.removeClass( "ui-state-focus" );
	},
	_destroy: $.noop,

	widget: function() {
		return this.element;
	},

	option: function( key, value ) {
		var options = key,
			parts,
			curOption,
			i;

		if ( arguments.length === 0 ) {
			// don't return a reference to the internal hash
			return $.widget.extend( {}, this.options );
		}

		if ( typeof key === "string" ) {
			// handle nested keys, e.g., "foo.bar" => { foo: { bar: ___ } }
			options = {};
			parts = key.split( "." );
			key = parts.shift();
			if ( parts.length ) {
				curOption = options[ key ] = $.widget.extend( {}, this.options[ key ] );
				for ( i = 0; i < parts.length - 1; i++ ) {
					curOption[ parts[ i ] ] = curOption[ parts[ i ] ] || {};
					curOption = curOption[ parts[ i ] ];
				}
				key = parts.pop();
				if ( value === undefined ) {
					return curOption[ key ] === undefined ? null : curOption[ key ];
				}
				curOption[ key ] = value;
			} else {
				if ( value === undefined ) {
					return this.options[ key ] === undefined ? null : this.options[ key ];
				}
				options[ key ] = value;
			}
		}

		this._setOptions( options );

		return this;
	},
	_setOptions: function( options ) {
		var key;

		for ( key in options ) {
			this._setOption( key, options[ key ] );
		}

		return this;
	},
	_setOption: function( key, value ) {
		this.options[ key ] = value;

		if ( key === "disabled" ) {
			this.widget()
				.toggleClass( this.widgetFullName + "-disabled ui-state-disabled", !!value )
				.attr( "aria-disabled", value );
			this.hoverable.removeClass( "ui-state-hover" );
			this.focusable.removeClass( "ui-state-focus" );
		}

		return this;
	},

	enable: function() {
		return this._setOption( "disabled", false );
	},
	disable: function() {
		return this._setOption( "disabled", true );
	},

	_on: function( suppressDisabledCheck, element, handlers ) {
		var delegateElement,
			instance = this;

		// no suppressDisabledCheck flag, shuffle arguments
		if ( typeof suppressDisabledCheck !== "boolean" ) {
			handlers = element;
			element = suppressDisabledCheck;
			suppressDisabledCheck = false;
		}

		// no element argument, shuffle and use this.element
		if ( !handlers ) {
			handlers = element;
			element = this.element;
			delegateElement = this.widget();
		} else {
			// accept selectors, DOM elements
			element = delegateElement = $( element );
			this.bindings = this.bindings.add( element );
		}

		$.each( handlers, function( event, handler ) {
			function handlerProxy() {
				// allow widgets to customize the disabled handling
				// - disabled as an array instead of boolean
				// - disabled class as method for disabling individual parts
				if ( !suppressDisabledCheck &&
						( instance.options.disabled === true ||
							$( this ).hasClass( "ui-state-disabled" ) ) ) {
					return;
				}
				return ( typeof handler === "string" ? instance[ handler ] : handler )
					.apply( instance, arguments );
			}

			// copy the guid so direct unbinding works
			if ( typeof handler !== "string" ) {
				handlerProxy.guid = handler.guid =
					handler.guid || handlerProxy.guid || $.guid++;
			}

			var match = event.match( /^(\w+)\s*(.*)$/ ),
				eventName = match[1] + instance.eventNamespace,
				selector = match[2];
			if ( selector ) {
				delegateElement.delegate( selector, eventName, handlerProxy );
			} else {
				element.bind( eventName, handlerProxy );
			}
		});
	},

	_off: function( element, eventName ) {
		eventName = (eventName || "").split( " " ).join( this.eventNamespace + " " ) + this.eventNamespace;
		element.unbind( eventName ).undelegate( eventName );
	},

	_delay: function( handler, delay ) {
		function handlerProxy() {
			return ( typeof handler === "string" ? instance[ handler ] : handler )
				.apply( instance, arguments );
		}
		var instance = this;
		return setTimeout( handlerProxy, delay || 0 );
	},

	_hoverable: function( element ) {
		this.hoverable = this.hoverable.add( element );
		this._on( element, {
			mouseenter: function( event ) {
				$( event.currentTarget ).addClass( "ui-state-hover" );
			},
			mouseleave: function( event ) {
				$( event.currentTarget ).removeClass( "ui-state-hover" );
			}
		});
	},

	_focusable: function( element ) {
		this.focusable = this.focusable.add( element );
		this._on( element, {
			focusin: function( event ) {
				$( event.currentTarget ).addClass( "ui-state-focus" );
			},
			focusout: function( event ) {
				$( event.currentTarget ).removeClass( "ui-state-focus" );
			}
		});
	},

	_trigger: function( type, event, data ) {
		var prop, orig,
			callback = this.options[ type ];

		data = data || {};
		event = $.Event( event );
		event.type = ( type === this.widgetEventPrefix ?
			type :
			this.widgetEventPrefix + type ).toLowerCase();
		// the original event may come from any element
		// so we need to reset the target on the new event
		event.target = this.element[ 0 ];

		// copy original event properties over to the new event
		orig = event.originalEvent;
		if ( orig ) {
			for ( prop in orig ) {
				if ( !( prop in event ) ) {
					event[ prop ] = orig[ prop ];
				}
			}
		}

		this.element.trigger( event, data );
		return !( $.isFunction( callback ) &&
			callback.apply( this.element[0], [ event ].concat( data ) ) === false ||
			event.isDefaultPrevented() );
	}
};

$.each( { show: "fadeIn", hide: "fadeOut" }, function( method, defaultEffect ) {
	$.Widget.prototype[ "_" + method ] = function( element, options, callback ) {
		if ( typeof options === "string" ) {
			options = { effect: options };
		}
		var hasOptions,
			effectName = !options ?
				method :
				options === true || typeof options === "number" ?
					defaultEffect :
					options.effect || defaultEffect;
		options = options || {};
		if ( typeof options === "number" ) {
			options = { duration: options };
		}
		hasOptions = !$.isEmptyObject( options );
		options.complete = callback;
		if ( options.delay ) {
			element.delay( options.delay );
		}
		if ( hasOptions && $.effects && $.effects.effect[ effectName ] ) {
			element[ method ]( options );
		} else if ( effectName !== method && element[ effectName ] ) {
			element[ effectName ]( options.duration, options.easing, callback );
		} else {
			element.queue(function( next ) {
				$( this )[ method ]();
				if ( callback ) {
					callback.call( element[ 0 ] );
				}
				next();
			});
		}
	};
});

})( jQuery );
(function( $, undefined ) {

var uid = 0,
	hideProps = {},
	showProps = {};

hideProps.height = hideProps.paddingTop = hideProps.paddingBottom =
	hideProps.borderTopWidth = hideProps.borderBottomWidth = "hide";
showProps.height = showProps.paddingTop = showProps.paddingBottom =
	showProps.borderTopWidth = showProps.borderBottomWidth = "show";

$.widget( "ui.accordion", {
	version: "1.10.2",
	options: {
		active: 0,
		animate: {},
		collapsible: false,
		event: "click",
		header: "> li > :first-child,> :not(li):even",
		heightStyle: "auto",
		icons: {
			activeHeader: "ui-icon-triangle-1-s",
			header: "ui-icon-triangle-1-e"
		},

		// callbacks
		activate: null,
		beforeActivate: null
	},

	_create: function() {
		var options = this.options;
		this.prevShow = this.prevHide = $();
		this.element.addClass( "ui-accordion ui-widget ui-helper-reset" )
			// ARIA
			.attr( "role", "tablist" );

		// don't allow collapsible: false and active: false / null
		if ( !options.collapsible && (options.active === false || options.active == null) ) {
			options.active = 0;
		}

		this._processPanels();
		// handle negative values
		if ( options.active < 0 ) {
			options.active += this.headers.length;
		}
		this._refresh();
	},

	_getCreateEventData: function() {
		return {
			header: this.active,
			panel: !this.active.length ? $() : this.active.next(),
			content: !this.active.length ? $() : this.active.next()
		};
	},

	_createIcons: function() {
		var icons = this.options.icons;
		if ( icons ) {
			$( "<span>" )
				.addClass( "ui-accordion-header-icon ui-icon " + icons.header )
				.prependTo( this.headers );
			this.active.children( ".ui-accordion-header-icon" )
				.removeClass( icons.header )
				.addClass( icons.activeHeader );
			this.headers.addClass( "ui-accordion-icons" );
		}
	},

	_destroyIcons: function() {
		this.headers
			.removeClass( "ui-accordion-icons" )
			.children( ".ui-accordion-header-icon" )
				.remove();
	},

	_destroy: function() {
		var contents;

		// clean up main element
		this.element
			.removeClass( "ui-accordion ui-widget ui-helper-reset" )
			.removeAttr( "role" );

		// clean up headers
		this.headers
			.removeClass( "ui-accordion-header ui-accordion-header-active ui-helper-reset ui-state-default ui-corner-all ui-state-active ui-state-disabled ui-corner-top" )
			.removeAttr( "role" )
			.removeAttr( "aria-selected" )
			.removeAttr( "aria-controls" )
			.removeAttr( "tabIndex" )
			.each(function() {
				if ( /^ui-accordion/.test( this.id ) ) {
					this.removeAttribute( "id" );
				}
			});
		this._destroyIcons();

		// clean up content panels
		contents = this.headers.next()
			.css( "display", "" )
			.removeAttr( "role" )
			.removeAttr( "aria-expanded" )
			.removeAttr( "aria-hidden" )
			.removeAttr( "aria-labelledby" )
			.removeClass( "ui-helper-reset ui-widget-content ui-corner-bottom ui-accordion-content ui-accordion-content-active ui-state-disabled" )
			.each(function() {
				if ( /^ui-accordion/.test( this.id ) ) {
					this.removeAttribute( "id" );
				}
			});
		if ( this.options.heightStyle !== "content" ) {
			contents.css( "height", "" );
		}
	},

	_setOption: function( key, value ) {
		if ( key === "active" ) {
			// _activate() will handle invalid values and update this.options
			this._activate( value );
			return;
		}

		if ( key === "event" ) {
			if ( this.options.event ) {
				this._off( this.headers, this.options.event );
			}
			this._setupEvents( value );
		}

		this._super( key, value );

		// setting collapsible: false while collapsed; open first panel
		if ( key === "collapsible" && !value && this.options.active === false ) {
			this._activate( 0 );
		}

		if ( key === "icons" ) {
			this._destroyIcons();
			if ( value ) {
				this._createIcons();
			}
		}

		// #5332 - opacity doesn't cascade to positioned elements in IE
		// so we need to add the disabled class to the headers and panels
		if ( key === "disabled" ) {
			this.headers.add( this.headers.next() )
				.toggleClass( "ui-state-disabled", !!value );
		}
	},

	_keydown: function( event ) {
		/*jshint maxcomplexity:15*/
		if ( event.altKey || event.ctrlKey ) {
			return;
		}

		var keyCode = $.ui.keyCode,
			length = this.headers.length,
			currentIndex = this.headers.index( event.target ),
			toFocus = false;

		switch ( event.keyCode ) {
			case keyCode.RIGHT:
			case keyCode.DOWN:
				toFocus = this.headers[ ( currentIndex + 1 ) % length ];
				break;
			case keyCode.LEFT:
			case keyCode.UP:
				toFocus = this.headers[ ( currentIndex - 1 + length ) % length ];
				break;
			case keyCode.SPACE:
			case keyCode.ENTER:
				this._eventHandler( event );
				break;
			case keyCode.HOME:
				toFocus = this.headers[ 0 ];
				break;
			case keyCode.END:
				toFocus = this.headers[ length - 1 ];
				break;
		}

		if ( toFocus ) {
			$( event.target ).attr( "tabIndex", -1 );
			$( toFocus ).attr( "tabIndex", 0 );
			toFocus.focus();
			event.preventDefault();
		}
	},

	_panelKeyDown : function( event ) {
		if ( event.keyCode === $.ui.keyCode.UP && event.ctrlKey ) {
			$( event.currentTarget ).prev().focus();
		}
	},

	refresh: function() {
		var options = this.options;
		this._processPanels();

		// was collapsed or no panel
		if ( ( options.active === false && options.collapsible === true ) || !this.headers.length ) {
			options.active = false;
			this.active = $();
		// active false only when collapsible is true
		} if ( options.active === false ) {
			this._activate( 0 );
		// was active, but active panel is gone
		} else if ( this.active.length && !$.contains( this.element[ 0 ], this.active[ 0 ] ) ) {
			// all remaining panel are disabled
			if ( this.headers.length === this.headers.find(".ui-state-disabled").length ) {
				options.active = false;
				this.active = $();
			// activate previous panel
			} else {
				this._activate( Math.max( 0, options.active - 1 ) );
			}
		// was active, active panel still exists
		} else {
			// make sure active index is correct
			options.active = this.headers.index( this.active );
		}

		this._destroyIcons();

		this._refresh();
	},

	_processPanels: function() {
		this.headers = this.element.find( this.options.header )
			.addClass( "ui-accordion-header ui-helper-reset ui-state-default ui-corner-all" );

		this.headers.next()
			.addClass( "ui-accordion-content ui-helper-reset ui-widget-content ui-corner-bottom" )
			.filter(":not(.ui-accordion-content-active)")
			.hide();
	},

	_refresh: function() {
		var maxHeight,
			options = this.options,
			heightStyle = options.heightStyle,
			parent = this.element.parent(),
			accordionId = this.accordionId = "ui-accordion-" +
				(this.element.attr( "id" ) || ++uid);

		this.active = this._findActive( options.active )
			.addClass( "ui-accordion-header-active ui-state-active ui-corner-top" )
			.removeClass( "ui-corner-all" );
		this.active.next()
			.addClass( "ui-accordion-content-active" )
			.show();

		this.headers
			.attr( "role", "tab" )
			.each(function( i ) {
				var header = $( this ),
					headerId = header.attr( "id" ),
					panel = header.next(),
					panelId = panel.attr( "id" );
				if ( !headerId ) {
					headerId = accordionId + "-header-" + i;
					header.attr( "id", headerId );
				}
				if ( !panelId ) {
					panelId = accordionId + "-panel-" + i;
					panel.attr( "id", panelId );
				}
				header.attr( "aria-controls", panelId );
				panel.attr( "aria-labelledby", headerId );
			})
			.next()
				.attr( "role", "tabpanel" );

		this.headers
			.not( this.active )
			.attr({
				"aria-selected": "false",
				tabIndex: -1
			})
			.next()
				.attr({
					"aria-expanded": "false",
					"aria-hidden": "true"
				})
				.hide();

		// make sure at least one header is in the tab order
		if ( !this.active.length ) {
			this.headers.eq( 0 ).attr( "tabIndex", 0 );
		} else {
			this.active.attr({
				"aria-selected": "true",
				tabIndex: 0
			})
			.next()
				.attr({
					"aria-expanded": "true",
					"aria-hidden": "false"
				});
		}

		this._createIcons();

		this._setupEvents( options.event );

		if ( heightStyle === "fill" ) {
			maxHeight = parent.height();
			this.element.siblings( ":visible" ).each(function() {
				var elem = $( this ),
					position = elem.css( "position" );

				if ( position === "absolute" || position === "fixed" ) {
					return;
				}
				maxHeight -= elem.outerHeight( true );
			});

			this.headers.each(function() {
				maxHeight -= $( this ).outerHeight( true );
			});

			this.headers.next()
				.each(function() {
					$( this ).height( Math.max( 0, maxHeight -
						$( this ).innerHeight() + $( this ).height() ) );
				})
				.css( "overflow", "auto" );
		} else if ( heightStyle === "auto" ) {
			maxHeight = 0;
			this.headers.next()
				.each(function() {
					maxHeight = Math.max( maxHeight, $( this ).css( "height", "" ).height() );
				})
				.height( maxHeight );
		}
	},

	_activate: function( index ) {
		var active = this._findActive( index )[ 0 ];

		// trying to activate the already active panel
		if ( active === this.active[ 0 ] ) {
			return;
		}

		// trying to collapse, simulate a click on the currently active header
		active = active || this.active[ 0 ];

		this._eventHandler({
			target: active,
			currentTarget: active,
			preventDefault: $.noop
		});
	},

	_findActive: function( selector ) {
		return typeof selector === "number" ? this.headers.eq( selector ) : $();
	},

	_setupEvents: function( event ) {
		var events = {
			keydown: "_keydown"
		};
		if ( event ) {
			$.each( event.split(" "), function( index, eventName ) {
				events[ eventName ] = "_eventHandler";
			});
		}

		this._off( this.headers.add( this.headers.next() ) );
		this._on( this.headers, events );
		this._on( this.headers.next(), { keydown: "_panelKeyDown" });
		this._hoverable( this.headers );
		this._focusable( this.headers );
	},

	_eventHandler: function( event ) {
		var options = this.options,
			active = this.active,
			clicked = $( event.currentTarget ),
			clickedIsActive = clicked[ 0 ] === active[ 0 ],
			collapsing = clickedIsActive && options.collapsible,
			toShow = collapsing ? $() : clicked.next(),
			toHide = active.next(),
			eventData = {
				oldHeader: active,
				oldPanel: toHide,
				newHeader: collapsing ? $() : clicked,
				newPanel: toShow
			};

		event.preventDefault();

		if (
				// click on active header, but not collapsible
				( clickedIsActive && !options.collapsible ) ||
				// allow canceling activation
				( this._trigger( "beforeActivate", event, eventData ) === false ) ) {
			return;
		}

		options.active = collapsing ? false : this.headers.index( clicked );

		// when the call to ._toggle() comes after the class changes
		// it causes a very odd bug in IE 8 (see #6720)
		this.active = clickedIsActive ? $() : clicked;
		this._toggle( eventData );

		// switch classes
		// corner classes on the previously active header stay after the animation
		active.removeClass( "ui-accordion-header-active ui-state-active" );
		if ( options.icons ) {
			active.children( ".ui-accordion-header-icon" )
				.removeClass( options.icons.activeHeader )
				.addClass( options.icons.header );
		}

		if ( !clickedIsActive ) {
			clicked
				.removeClass( "ui-corner-all" )
				.addClass( "ui-accordion-header-active ui-state-active ui-corner-top" );
			if ( options.icons ) {
				clicked.children( ".ui-accordion-header-icon" )
					.removeClass( options.icons.header )
					.addClass( options.icons.activeHeader );
			}

			clicked
				.next()
				.addClass( "ui-accordion-content-active" );
		}
	},

	_toggle: function( data ) {
		var toShow = data.newPanel,
			toHide = this.prevShow.length ? this.prevShow : data.oldPanel;

		// handle activating a panel during the animation for another activation
		this.prevShow.add( this.prevHide ).stop( true, true );
		this.prevShow = toShow;
		this.prevHide = toHide;

		if ( this.options.animate ) {
			this._animate( toShow, toHide, data );
		} else {
			toHide.hide();
			toShow.show();
			this._toggleComplete( data );
		}

		toHide.attr({
			"aria-expanded": "false",
			"aria-hidden": "true"
		});
		toHide.prev().attr( "aria-selected", "false" );
		// if we're switching panels, remove the old header from the tab order
		// if we're opening from collapsed state, remove the previous header from the tab order
		// if we're collapsing, then keep the collapsing header in the tab order
		if ( toShow.length && toHide.length ) {
			toHide.prev().attr( "tabIndex", -1 );
		} else if ( toShow.length ) {
			this.headers.filter(function() {
				return $( this ).attr( "tabIndex" ) === 0;
			})
			.attr( "tabIndex", -1 );
		}

		toShow
			.attr({
				"aria-expanded": "true",
				"aria-hidden": "false"
			})
			.prev()
				.attr({
					"aria-selected": "true",
					tabIndex: 0
				});
	},

	_animate: function( toShow, toHide, data ) {
		var total, easing, duration,
			that = this,
			adjust = 0,
			down = toShow.length &&
				( !toHide.length || ( toShow.index() < toHide.index() ) ),
			animate = this.options.animate || {},
			options = down && animate.down || animate,
			complete = function() {
				that._toggleComplete( data );
			};

		if ( typeof options === "number" ) {
			duration = options;
		}
		if ( typeof options === "string" ) {
			easing = options;
		}
		// fall back from options to animation in case of partial down settings
		easing = easing || options.easing || animate.easing;
		duration = duration || options.duration || animate.duration;

		if ( !toHide.length ) {
			return toShow.animate( showProps, duration, easing, complete );
		}
		if ( !toShow.length ) {
			return toHide.animate( hideProps, duration, easing, complete );
		}

		total = toShow.show().outerHeight();
		toHide.animate( hideProps, {
			duration: duration,
			easing: easing,
			step: function( now, fx ) {
				fx.now = Math.round( now );
			}
		});
		toShow
			.hide()
			.animate( showProps, {
				duration: duration,
				easing: easing,
				complete: complete,
				step: function( now, fx ) {
					fx.now = Math.round( now );
					if ( fx.prop !== "height" ) {
						adjust += fx.now;
					} else if ( that.options.heightStyle !== "content" ) {
						fx.now = Math.round( total - toHide.outerHeight() - adjust );
						adjust = 0;
					}
				}
			});
	},

	_toggleComplete: function( data ) {
		var toHide = data.oldPanel;

		toHide
			.removeClass( "ui-accordion-content-active" )
			.prev()
				.removeClass( "ui-corner-top" )
				.addClass( "ui-corner-all" );

		// Work around for rendering bug in IE (#5421)
		if ( toHide.length ) {
			toHide.parent()[0].className = toHide.parent()[0].className;
		}

		this._trigger( "activate", null, data );
	}
});

})( jQuery );
