/**
* Tabs - jQuery plugin for accessible, unobtrusive tabs
* @requires jQuery v1.1.1
*
* http://stilbuero.de/tabs/
*
* Copyright (c) 2006 Klaus Hartl (stilbuero.de)
* Dual licensed under the MIT and GPL licenses:
* http://www.opensource.org/licenses/mit-license.php
* http://www.gnu.org/licenses/gpl.html
*
* Version: 2.7.4
*/

(function ($) { // block scope

	$.extend({
		tabs: {
			remoteCount: 0 // TODO in Tabs 3 this is going to be more cleanly in one single namespace
		}
	});

	/**
	* Create an accessible, unobtrusive tab interface based on a particular HTML structure.
	*
	* The underlying HTML has to look like this:
	*
	* <div id="container">
	*     <ul>
	*         <li><a href="#fragment-1">Section 1</a></li>
	*         <li><a href="#fragment-2">Section 2</a></li>
	*         <li><a href="#fragment-3">Section 3</a></li>
	*     </ul>
	*     <div id="fragment-1">
	*
	*     </div>
	*     <div id="fragment-2">
	*
	*     </div>
	*     <div id="fragment-3">
	*
	*     </div>
	* </div>
	*
	* Each anchor in the unordered list points directly to a section below represented by one of the
	* divs (the URI in the anchor's href attribute refers to the fragment with the corresponding id).
	* Because such HTML structure is fully functional on its own, e.g. without JavaScript, the tab
	* interface is accessible and unobtrusive.
	*
	* A tab is also bookmarkable via hash in the URL. Use the History/Remote plugin (Tabs will
	* auto-detect its presence) to fix the back (and forward) button.
	*
	* @example $('#container').tabs();
	* @desc Create a basic tab interface.
	* @example $('#container').tabs(2);
	* @desc Create a basic tab interface with the second tab initially activated.
	* @example $('#container').tabs({disabled: [3, 4]});
	* @desc Create a tab interface with the third and fourth tab being disabled.
	* @example $('#container').tabs({fxSlide: true});
	* @desc Create a tab interface that uses slide down/up animations for showing/hiding tab
	*       content upon tab switching.
	*
	* @param Number initial An integer specifying the position of the tab (no zero-based index) that
	*                       gets activated at first (on page load). Two alternative ways to specify
	*                       the active tab will overrule this argument. First a li element
	*                       (representing one single tab) belonging to the selected tab class, e.g.
	*                       set the selected tab class (default: "tabs-selected", see option
	*                       selectedClass) for one of the unordered li elements in the HTML source.
	*                       In addition if a fragment identifier/hash in the URL of the page refers
	*                       to the id of a tab container of a tab interface the corresponding tab will
	*                       be activated and both the initial argument as well as an eventually
	*                       declared class attribute will be overruled. Defaults to 1 if omitted.
	* @param Object settings An object literal containing key/value pairs to provide optional settings.
	* @option Array<Number> disabled An array containing the position of the tabs (no zero-based index)
	*                                that should be disabled on initialization. Default value: null.
	*                                A tab can also be disabled by simply adding the disabling class
	*                                (default: "tabs-disabled", see option disabledClass) to the li
	*                                element representing that particular tab.
	* @option Boolean bookmarkable Boolean flag indicating if support for bookmarking and history (via
	*                              changing hash in the URL of the browser) is enabled. Default value:
	*                              false, unless the History/Remote plugin is included. In that case the
	*                              default value becomes true. @see $.ajaxHistory.initialize
	* @option Boolean remote Boolean flag indicating that tab content has to be loaded remotely from
	*                        the url given in the href attribute of the tab menu anchor elements.
	* @option String spinner The content of this string is shown in a tab while remote content is loading.
	*                        Insert plain text as well as an img here. To turn off this notification
	*                        pass an empty string or null. Default: "Loading&#8230;".
	* @option String hashPrefix A String that is used for constructing the hash the link's href attribute
	*                           of a remote tab gets altered to, such as "#remote-1".
	*                           Default value: "remote-tab-".
	* @option Boolean fxFade Boolean flag indicating whether fade in/out animations are used for tab
	*                        switching. Can be combined with fxSlide. Will overrule fxShow/fxHide.
	*                        Default value: false.
	* @option Boolean fxSlide Boolean flag indicating whether slide down/up animations are used for tab
	*                         switching. Can be combined with fxFade. Will overrule fxShow/fxHide.
	*                         Default value: false.
	* @option String|Number fxSpeed A string representing one of the three predefined speeds ("slow",
	*                               "normal", or "fast") or the number of milliseconds (e.g. 1000) to
	*                               run an animation. Default value: "normal".
	* @option Object fxShow An object literal of the form jQuery's animate function expects for making
	*                       your own, custom animation to reveal a tab upon tab switch. Unlike fxFade
	*                       or fxSlide this animation is independent from an optional hide animation.
	*                       Default value: null. @see animate
	* @option Object fxHide An object literal of the form jQuery's animate function expects for making
	*                       your own, custom animation to hide a tab upon tab switch. Unlike fxFade
	*                       or fxSlide this animation is independent from an optional show animation.
	*                       Default value: null. @see animate
	* @option String|Number fxShowSpeed A string representing one of the three predefined speeds
	*                                   ("slow", "normal", or "fast") or the number of milliseconds
	*                                   (e.g. 1000) to run the animation specified in fxShow.
	*                                   Default value: fxSpeed.
	* @option String|Number fxHideSpeed A string representing one of the three predefined speeds
	*                                   ("slow", "normal", or "fast") or the number of milliseconds
	*                                   (e.g. 1000) to run the animation specified in fxHide.
	*                                   Default value: fxSpeed.
	* @option Boolean fxAutoHeight Boolean flag that if set to true causes all tab heights
	*                              to be constant (being the height of the tallest tab).
	*                              Default value: false.
	* @option Function onClick A function to be invoked upon tab switch, immediatly after a tab has
	*                          been clicked, e.g. before the other's tab content gets hidden. The
	*                          function gets passed three arguments: the first one is the clicked
	*                          tab (e.g. an anchor element), the second one is the DOM element
	*                          containing the content of the clicked tab (e.g. the div), the third
	*                          argument is the one of the tab that gets hidden. If this callback
	*                          returns false, the tab switch is canceled (use to disallow tab
	*                          switching for the reason of a failed form validation for example).
	*                          Default value: null.
	* @option Function onHide A function to be invoked upon tab switch, immediatly after one tab's
	*                         content got hidden (with or without an animation) and right before the
	*                         next tab is revealed. The function gets passed three arguments: the
	*                         first one is the clicked tab (e.g. an anchor element), the second one
	*                         is the DOM element containing the content of the clicked tab, (e.g. the
	*                         div), the third argument is the one of the tab that gets hidden.
	*                         Default value: null.
	* @option Function onShow A function to be invoked upon tab switch. This function is invoked
	*                         after the new tab has been revealed, e.g. after the switch is completed.
	*                         The function gets passed three arguments: the first one is the clicked
	*                         tab (e.g. an anchor element), the second one is the DOM element
	*                         containing the content of the clicked tab, (e.g. the div), the third
	*                         argument is the one of the tab that gets hidden. Default value: null.
	* @option String navClass A CSS class that is used to identify the tabs unordered list by class if
	*                         the required HTML structure differs from the default one.
	*                         Default value: "tabs-nav".
	* @option String selectedClass The CSS class attached to the li element representing the
	*                              currently selected (active) tab. Default value: "tabs-selected".
	* @option String disabledClass The CSS class attached to the li element representing a disabled
	*                              tab. Default value: "tabs-disabled".
	* @option String containerClass A CSS class that is used to identify tab containers by class if
	*                               the required HTML structure differs from the default one.
	*                               Default value: "tabs-container".
	* @option String hideClass The CSS class used for hiding inactive tabs. A class is used instead
	*                          of "display: none" in the style attribute to maintain control over
	*                          visibility in other media types than screen, most notably print.
	*                          Default value: "tabs-hide".
	* @option String loadingClass The CSS class used for indicating that an Ajax tab is currently
	*                             loading, for example by showing a spinner.
	*                             Default value: "tabs-loading".
	* @option String tabStruct @deprecated A CSS selector or basic XPath expression reflecting a
	*                          nested HTML structure that is different from the default single div
	*                          structure (one div with an id inside the overall container holds one
	*                          tab's content). If for instance an additional div is required to wrap
	*                          up the several tab containers such a structure is expressed by "div>div".
	*                          Default value: "div".
	* @type jQuery
	*
	* @name tabs
	* @cat Plugins/Tabs
	* @author Klaus Hartl/klaus.hartl@stilbuero.de
	*/
	$.fn.tabs = function (initial, settings) {

		// settings
		if (typeof initial == 'object') settings = initial; // no initial tab given but a settings object
		settings = $.extend({
			initial: (initial && typeof initial == 'number' && initial > 0) ? --initial : 0,
			disabled: null,
			bookmarkable: $.ajaxHistory ? true : false,
			remote: false,
			spinner: 'Loading&#8230;',
			hashPrefix: 'remote-tab-',
			fxFade: null,
			fxSlide: null,
			fxShow: null,
			fxHide: null,
			fxSpeed: 'normal',
			fxShowSpeed: null,
			fxHideSpeed: null,
			fxAutoHeight: false,
			onClick: null,
			onHide: null,
			onShow: null,
			navClass: 'tabs-nav',
			selectedClass: 'tabs-selected',
			disabledClass: 'tabs-disabled',
			containerClass: 'tabs-container',
			hideClass: 'tabs-hide',
			loadingClass: 'tabs-loading',
			tabStruct: 'div'
		}, settings || {});

		$.browser.msie6 = $.browser.msie && ($.browser.version && $.browser.version < 7 || /MSIE 6.0/.test(navigator.userAgent)); // do not check for 6.0 alone, userAgent in Windows Vista has "Windows NT 6.0"

		// helper to prevent scroll to fragment
		function unFocus() {
			scrollTo(0, 0);
		}

		// initialize tabs
		return this.each(function () {

			// remember wrapper for later
			var container = this;

			// setup nav
			var nav = $('ul.' + settings.navClass, container);
			nav = nav.size() && nav || $('>ul:eq(0)', container); // fallback to default structure
			var tabs = $('a', nav);

			// prepare remote tabs
			if (settings.remote) {
				tabs.each(function () {
					var id = settings.hashPrefix + (++$.tabs.remoteCount), hash = '#' + id, url = this.href;
					this.href = hash;
					$('<div id="' + id + '" class="' + settings.containerClass + '"></div>').appendTo(container);

					$(this).bind('loadRemoteTab', function (e, callback) {
						var $$ = $(this).addClass(settings.loadingClass), span = $('span', this)[0], tabTitle = span.innerHTML;
						if (settings.spinner) {
							// TODO if spinner is image
							span.innerHTML = '<em>' + settings.spinner + '</em>'; // WARNING: html(...) crashes Safari with jQuery 1.1.2
						}
						setTimeout(function () { // Timeout is again required in IE, "wait" for id being restored
							$(hash).load(url, function () {
								if (settings.spinner) {
									span.innerHTML = tabTitle; // WARNING: html(...) crashes Safari with jQuery 1.1.2
								}
								$$.removeClass(settings.loadingClass);
								callback && callback();
							});
						}, 0);
					});

				});
			}

			// set up containers
			var containers = $('div.' + settings.containerClass, container);
			containers = containers.size() && containers || $('>' + settings.tabStruct, container); // fallback to default structure

			// attach classes for styling if not present
			nav.is('.' + settings.navClass) || nav.addClass(settings.navClass);
			containers.each(function () {
				var $$ = $(this);
				$$.is('.' + settings.containerClass) || $$.addClass(settings.containerClass);
			});

			// try to retrieve active tab from class in HTML
			var hasSelectedClass = $('li', nav).index($('li.' + settings.selectedClass, nav)[0]);
			if (hasSelectedClass >= 0) {
				settings.initial = hasSelectedClass;
			}

			// try to retrieve active tab from hash in url, will override class in HTML
			if (location.hash) {
				tabs.each(function (i) {
					if (this.hash == location.hash) {
						settings.initial = i;
						// prevent page scroll to fragment
						if (($.browser.msie || $.browser.opera) && !settings.remote) {
							var toShow = $(location.hash);
							var toShowId = toShow.attr('id');
							toShow.attr('id', '');
							setTimeout(function () {
								toShow.attr('id', toShowId); // restore id
							}, 500);
						}
						unFocus();
						return false; // break
					}
				});
			}
			if ($.browser.msie) {
				unFocus(); // fix IE focussing bottom of the page for some unknown reason
			}

			// highlight tab accordingly
			containers.filter(':eq(' + settings.initial + ')').show().end().not(':eq(' + settings.initial + ')').addClass(settings.hideClass);
			$('li', nav).removeClass(settings.selectedClass).eq(settings.initial).addClass(settings.selectedClass); // we need to remove classes eventually if hash takes precedence over class
			// trigger load of initial tab
			tabs.eq(settings.initial).trigger('loadRemoteTab').end();

			// setup auto height
			if (settings.fxAutoHeight) {
				// helper
				var _setAutoHeight = function (reset) {
					// get tab heights in top to bottom ordered array
					var heights = $.map(containers.get(), function (el) {
						var h, jq = $(el);
						if (reset) {
							if ($.browser.msie6) {
								el.style.removeExpression('behaviour');
								el.style.height = '';
								el.minHeight = null;
							}
							h = jq.css({ 'min-height': '' }).height(); // use jQuery's height() to get hidden element values
						} else {
							h = jq.height(); // use jQuery's height() to get hidden element values
						}
						return h;
					}).sort(function (a, b) {
						return b - a;
					});
					if ($.browser.msie6) {
						containers.each(function () {
							this.minHeight = heights[0] + 'px';
							this.style.setExpression('behaviour', 'this.style.height = this.minHeight ? this.minHeight : "1px"'); // using an expression to not make print styles useless
						});
					} else {
						containers.css({ 'min-height': heights[0] + 'px' });
					}
				};
				// call once for initialization
				_setAutoHeight();
				// trigger auto height adjustment if needed
				var cachedWidth = container.offsetWidth;
				var cachedHeight = container.offsetHeight;
				var watchFontSize = $('#tabs-watch-font-size').get(0) || $('<span id="tabs-watch-font-size">M</span>').css({ display: 'block', position: 'absolute', visibility: 'hidden' }).appendTo(document.body).get(0);
				var cachedFontSize = watchFontSize.offsetHeight;
				setInterval(function () {
					var currentWidth = container.offsetWidth;
					var currentHeight = container.offsetHeight;
					var currentFontSize = watchFontSize.offsetHeight;
					if (currentHeight > cachedHeight || currentWidth != cachedWidth || currentFontSize != cachedFontSize) {
						_setAutoHeight((currentWidth > cachedWidth || currentFontSize < cachedFontSize)); // if heights gets smaller reset min-height
						cachedWidth = currentWidth;
						cachedHeight = currentHeight;
						cachedFontSize = currentFontSize;
					}
				}, 50);
			}

			// setup animations
			var showAnim = {}, hideAnim = {}, showSpeed = settings.fxShowSpeed || settings.fxSpeed, hideSpeed = settings.fxHideSpeed || settings.fxSpeed;
			if (settings.fxSlide || settings.fxFade) {
				if (settings.fxSlide) {
					showAnim['height'] = 'show';
					hideAnim['height'] = 'hide';
				}
				if (settings.fxFade) {
					showAnim['opacity'] = 'show';
					hideAnim['opacity'] = 'hide';
				}
			} else {
				if (settings.fxShow) {
					showAnim = settings.fxShow;
				} else { // use some kind of animation to prevent browser scrolling to the tab
					showAnim['min-width'] = 0; // avoid opacity, causes flicker in Firefox
					showSpeed = 1; // as little as 1 is sufficient
				}
				if (settings.fxHide) {
					hideAnim = settings.fxHide;
				} else { // use some kind of animation to prevent browser scrolling to the tab
					hideAnim['min-width'] = 0; // avoid opacity, causes flicker in Firefox
					hideSpeed = 1; // as little as 1 is sufficient
				}
			}

			// callbacks
			var onClick = settings.onClick, onHide = settings.onHide, onShow = settings.onShow;

			// attach activateTab event, required for activating a tab programmatically
			tabs.bind('triggerTab', function () {

				// if the tab is already selected or disabled or animation is still running stop here
				var li = $(this).parents('li:eq(0)');
				if (container.locked || li.is('.' + settings.selectedClass) || li.is('.' + settings.disabledClass)) {
					return false;
				}

				var hash = this.hash;

				if ($.browser.msie) {

					$(this).trigger('click');
					if (settings.bookmarkable) {
						$.ajaxHistory.update(hash);
						location.hash = hash.replace('#', '');
					}

				} else if ($.browser.safari) {

					// Simply setting location.hash puts Safari into the eternal load state... ugh! Submit a form instead.
					var tempForm = $('<form action="' + hash + '"><div><input type="submit" value="h" /></div></form>').get(0); // no need to append it to the body
					tempForm.submit(); // does not trigger the form's submit event...
					$(this).trigger('click'); // ...thus do stuff here
					if (settings.bookmarkable) {
						$.ajaxHistory.update(hash);
					}

				} else {

					if (settings.bookmarkable) {
						location.hash = hash.replace('#', '');
					} else {
						$(this).trigger('click');
					}

				}

			});

			// attach disable event, required for disabling a tab
			tabs.bind('disableTab', function () {
				var li = $(this).parents('li:eq(0)');
				if ($.browser.safari) { /* fix opacity of tab after disabling in Safari... */
					li.animate({ opacity: 0 }, 1, function () {
						li.css({ opacity: '' });
					});
				}
				li.addClass(settings.disabledClass);

			});

			// disabled from settings
			if (settings.disabled && settings.disabled.length) {
				for (var i = 0, k = settings.disabled.length; i < k; i++) {
					tabs.eq(--settings.disabled[i]).trigger('disableTab').end();
				}
			};

			// attach enable event, required for reenabling a tab
			tabs.bind('enableTab', function () {
				var li = $(this).parents('li:eq(0)');
				li.removeClass(settings.disabledClass);
				if ($.browser.safari) { /* fix disappearing tab after enabling in Safari... */
					li.animate({ opacity: 1 }, 1, function () {
						li.css({ opacity: '' });
					});
				}
			});

			// attach click event
			tabs.bind('click', function (e) {

				var trueClick = e.clientX; // add to history only if true click occured, not a triggered click
				var clicked = this, li = $(this).parents('li:eq(0)'), toShow = $(this.hash), toHide = containers.filter(':visible');

				// if animation is still running, tab is selected or disabled or onClick callback returns false stop here
				// check if onClick returns false last so that it is not executed for a disabled tab
				if (container['locked'] || li.is('.' + settings.selectedClass) || li.is('.' + settings.disabledClass) || typeof onClick == 'function' && onClick(this, toShow[0], toHide[0]) === false) {
					this.blur();
					return false;
				}

				container['locked'] = true;

				// show new tab
				if (toShow.size()) {

					// prevent scrollbar scrolling to 0 and than back in IE7, happens only if bookmarking/history is enabled
					if ($.browser.msie && settings.bookmarkable) {
						var toShowId = this.hash.replace('#', '');
						toShow.attr('id', '');
						setTimeout(function () {
							toShow.attr('id', toShowId); // restore id
						}, 0);
					}

					var resetCSS = { display: '', overflow: '', height: '' };
					if (!$.browser.msie) { // not in IE to prevent ClearType font issue
						resetCSS['opacity'] = '';
					}

					// switch tab, animation prevents browser scrolling to the fragment
					function switchTab() {
						if (settings.bookmarkable && trueClick) { // add to history only if true click occured, not a triggered click
							$.ajaxHistory.update(clicked.hash);
						}
						toHide.animate(hideAnim, hideSpeed, function () { //
							$(clicked).parents('li:eq(0)').addClass(settings.selectedClass).siblings().removeClass(settings.selectedClass);
							toHide.addClass(settings.hideClass).css(resetCSS); // maintain flexible height and accessibility in print etc.                        
							if (typeof onHide == 'function') {
								onHide(clicked, toShow[0], toHide[0]);
							}
							if (!(settings.fxSlide || settings.fxFade || settings.fxShow)) {
								toShow.css('display', 'block'); // prevent occasionally occuring flicker in Firefox cause by gap between showing and hiding the tab containers
							}
							toShow.animate(showAnim, showSpeed, function () {
								toShow.removeClass(settings.hideClass).css(resetCSS); // maintain flexible height and accessibility in print etc.
								if ($.browser.msie) {
									toHide[0].style.filter = '';
									toShow[0].style.filter = '';
								}
								if (typeof onShow == 'function') {
									onShow(clicked, toShow[0], toHide[0]);
								}
								container['locked'] = null;
							});
						});
					}

					if (!settings.remote) {
						switchTab();
					} else {
						$(clicked).trigger('loadRemoteTab', [switchTab]);
					}

				} else {
					alert('There is no such container.');
				}

				// Set scrollbar to saved position - need to use timeout with 0 to prevent browser scroll to target of hash
				var scrollX = window.pageXOffset || document.documentElement && document.documentElement.scrollLeft || document.body.scrollLeft || 0;
				var scrollY = window.pageYOffset || document.documentElement && document.documentElement.scrollTop || document.body.scrollTop || 0;
				setTimeout(function () {
					window.scrollTo(scrollX, scrollY);
				}, 0);

				this.blur(); // prevent IE from keeping other link focussed when using the back button

				return settings.bookmarkable && !!trueClick; // convert undefined to Boolean for IE

			});

			// enable history support if bookmarking and history is turned on
			if (settings.bookmarkable) {
				$.ajaxHistory.initialize(function () {
					tabs.eq(settings.initial).trigger('click').end();
				});
			}

		});

	};

	/**
	* Activate a tab programmatically with the given position (no zero-based index)
	* or its id, e.g. the URL's fragment identifier/hash representing a tab, as if the tab
	* itself were clicked.
	*
	* @example $('#container').triggerTab(2);
	* @desc Activate the second tab of the tab interface contained in <div id="container">.
	* @example $('#container').triggerTab(1);
	* @desc Activate the first tab of the tab interface contained in <div id="container">.
	* @example $('#container').triggerTab();
	* @desc Activate the first tab of the tab interface contained in <div id="container">.
	* @example $('#container').triggerTab('fragment-2');
	* @desc Activate a tab via its URL fragment identifier representation.
	*
	* @param String|Number tab Either a string that matches the id of the tab (the URL's
	*                          fragment identifier/hash representing a tab) or an integer
	*                          specifying the position of the tab (no zero-based index) to
	*                          be activated. If this parameter is omitted, the first tab
	*                          will be activated.
	* @type jQuery
	*
	* @name triggerTab
	* @cat Plugins/Tabs
	* @author Klaus Hartl/klaus.hartl@stilbuero.de
	*/

	/**
	* Disable a tab, so that clicking it has no effect.
	*
	* @example $('#container').disableTab(2);
	* @desc Disable the second tab of the tab interface contained in <div id="container">.
	*
	* @param String|Number tab Either a string that matches the id of the tab (the URL's
	*                          fragment identifier/hash representing a tab) or an integer
	*                          specifying the position of the tab (no zero-based index) to
	*                          be disabled. If this parameter is omitted, the first tab
	*                          will be disabled.
	* @type jQuery
	*
	* @name disableTab
	* @cat Plugins/Tabs
	* @author Klaus Hartl/klaus.hartl@stilbuero.de
	*/

	/**
	* Enable a tab that has been disabled.
	*
	* @example $('#container').enableTab(2);
	* @desc Enable the second tab of the tab interface contained in <div id="container">.
	*
	* @param String|Number tab Either a string that matches the id of the tab (the URL's
	*                          fragment identifier/hash representing a tab) or an integer
	*                          specifying the position of the tab (no zero-based index) to
	*                          be enabled. If this parameter is omitted, the first tab
	*                          will be enabled.
	* @type jQuery
	*
	* @name enableTab
	* @cat Plugins/Tabs
	* @author Klaus Hartl/klaus.hartl@stilbuero.de
	*/

	var tabEvents = ['triggerTab', 'disableTab', 'enableTab'];
	for (var i = 0; i < tabEvents.length; i++) {
		$.fn[tabEvents[i]] = (function (tabEvent) {
			return function (tab) {
				return this.each(function () {
					var nav = $('ul.tabs-nav', this);
					nav = nav.size() && nav || $('>ul:eq(0)', this); // fallback to default structure
					var a;
					if (!tab || typeof tab == 'number') {
						a = $('li a', nav).eq((tab && tab > 0 && tab - 1 || 0)); // fall back to 0
					} else if (typeof tab == 'string') {
						a = $('li a[@href$="#' + tab + '"]', nav);
					}
					a.trigger(tabEvent);
				});
			};
		})(tabEvents[i]);
	}

	/**
	* Get the position of the currently selected tab (no zero-based index).
	*
	* @example $('#container').activeTab();
	* @desc Get the position of the currently selected tab of an interface
	* contained in <div id="container">.
	*
	* @type Number
	*
	* @name activeTab
	* @cat Plugins/Tabs
	* @author Klaus Hartl/klaus.hartl@stilbuero.de
	*/

	$.fn.activeTab = function () {
		var selectedTabs = [];
		this.each(function () {
			var nav = $('ul.tabs-nav', this);
			nav = nav.size() && nav || $('>ul:eq(0)', this); //fallback to default structure
			var lis = $('li', nav);
			selectedTabs.push(lis.index(lis.filter('.tabs-selected')[0]) + 1);
		});
		return selectedTabs[0];
	};

})(jQuery);