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/**
 * jquery.LavaLamp enhances an unordered list of menu-items with a ballooning animated effect
 * similar to the Lava Lamps of the 1970s. Use the CSS provided with the demos at
 * http://nixboxdesigns.com/demos/jquery-lavalamp-demos.html or experiment with your own styles 
 *
 * Requires jQuery v1.3.2
 *
 * http://nixboxdesigns.com/demos/jquery-lavalamp.php
 *
 * Copyright (c) 2008, 2009 Jolyon Terwilliger, jolyon@nixbox.com
 * Source code Copyright (c) 2007, 2008
 * Dual licensed under the MIT and GPL licenses:
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 *
 * credits to Guillermo Rauch and Ganeshji Marwaha (gmarwaha.com) for previous editions
 *
 * Version: 1.0 - adapted for jQuery 1.2.x series
 * Version: 1.1 - added linum parameter
 * Version: 1.2 - modified to support vertical resizing of elements
 * Version: 1.3 - enhanced automatic <li> item hi-lighting - will attempt to
 *					lock onto li > a element with href closest to selected
 *					window.location
 *			 	- click always returns 'true' by default, for standard link follow through.
 *
 * Version: 1.3.1 - verified for use with jQuery 1.3 - should still work with 1.2.x series
 *				- changed linum parameter to startItem for clarity
 *				- improved slide-in accuracy for .back elements with borders
 *				- changed .current class to .selectedLava for clarity and improved
 *					support
 *				- appended 'Lava' to all internal class names to avoid conflicts
 *				- fixed bug applying selectedLava class to elements with matching
 *					location.hash
 *				- now supports jquery.compat plugin for cross-library support
 *				- performance improvements
 *				- added new options:
 *				autoReturn: true - if set to false, hover will not return to last selected
 *									item upon list mouseout.
 *				returnDelay: 0 - if set, will delay auto-return feature specified # of
 *									milliseconds.
 *				setOnClick: true - if set to false, hover will return to default element
 *									regardless of click event.
 *				homeLeft: 0, homeTop: 0 - if either set to non zero value, absolute
 *									positioned li element with class .homeLava is 
 *									prepended to list for homing feature.
 *				homeWidth: 0, homeHeight: 0 - if set, are used for creation of li.homeLava
 *									element.
 *				returnHome: false - if set along with homeLeft or homeTop, lavalamp hover
 *									will always return to li.home after click.
 *
 * Version: 1.3.2 - fixed: stray $ references inside the plugin to work with
 * 					jQuery.noConflict() properly - thanks Colin.
 *
 * Version: 1.3.3 - fixed: added closure with null passed argument for move() command in
 * 					returnDelay to fix errors some were seeing - thanks to Michel and 
 *					Richard for noticing this.
 *
 *					fixed: changed mouseover/out events to mouseenter/leave to fix jerky
 *					animation problem when using excessive margins instead of padding.  
 *					Thanks to Thomas for the solution and Chris for demonstrating the problem.
 *					this fix requires jQuery 1.3.2 to work.
 *
 *					enhanced: added 'noLava' class detection to prevent LavaLamp effect
 *					application to LI elements with this class. This feature allows you to
 *					create submenus - for details, see examples at
 *					http://nixboxdesigns.com/demos/jquery-lavalamp-demos.html
 *
 *					enhanced: modified to better automatically find default location for 
 *					relative links. Thanks to Harold for testing and finding this bug.
 *
 * Examples and usage:
 *
 * The HTML markup used to build the menu can be as simple as...
 *
 *       <ul class="lavaLamp">
 *           <li><a href="#">Phone Home</a></li>
 *           <li><a href="#">Make Contact</a></li>
 *           <li><a href="#">Board Ship</a></li>
 *           <li><a href="#">Fly to Venus</a></li>
 *       </ul>
 *
 * Once you have included the style sheet that comes with the plugin, you will have to include 
 * a reference to the jQuery library, easing plugin (optional) and the LavaLamp(this) plugin.
 *
 * Use the following snippet to initialize the menu using jQuery easing library::
 * Easing Library 1.3 available here:  http://plugins.jquery.com/project/Easing
 * 
 *   $(function() { $(".lavaLamp").lavaLamp({ fx: "easeOutBack", speed: 700}) });
 *
 * @param Object - You can specify all the options shown below as object variables:
 *
 * @option fx - default is "swing"
 * @example
 * $(".lavaLamp").lavaLamp({ fx: "easeOutElastic" });
 * @desc Creates a menu with "Elastic" easing effect. You need to include the easing plugin for this to work.
 *
 * @option speed - default is 500 ms
 * @example
 * $(".lavaLamp").lavaLamp({ speed: 500 });
 * @desc Creates a menu with an animation speed of 500 ms.
 *
 * @option click - no defaults
 * @example
 * $(".lavaLamp").lavaLamp({ click: function(event, menuItem) { return false; } });
 * @desc You can supply a callback to be executed when the menu item is clicked. 
 * The event object and the menu-item that was clicked will be passed in as arguments.
 * 
 * @option startItem - default is 'no'
 * @example
 * jQuery(".lavaLamp").lavaLamp({ startItem: 2 });
 * @desc startItem specifies the li element to default to, beginning with 0 for the first li element 
 * within the parent UL or OL used to initialize lavaLamp.  This can be used to set default
 * lavaLamp hilight on page reloads.
 */

(function(jQuery) {
jQuery.fn.lavaLamp = function(o) {
	o = jQuery.extend({ fx: 'swing',
					  	speed: 500, 
						click: function(){return true}, 
						startItem: 'no',
						autoReturn: true,
						returnDelay: 0,
						setOnClick: true,
						homeTop:0,
						homeLeft:0,
						homeWidth:0,
						homeHeight:0,
						returnHome:false
						}, 
					o || {});

	var $home;
	// create homeLava element if origin dimensions set
	if (o.homeTop || o.homeLeft) { 
		$home = jQuery('<li class="homeLava selectedLava"></li>').css({ left:o.homeLeft, top:o.homeTop, width:o.homeWidth, height:o.homeHeight, position:'absolute' });
		jQuery(this).prepend($home);
	}
		
	return this.each(function() {
		var path = location.pathname + location.search + location.hash;
		var $selected = new Object;
		var delayTimer;
		var $back;
		var ce; //current_element
		
		var $li = jQuery('li:not(.noLava)', this);
		// check for complete path match, if so flag element into $selected
		if ( o.startItem == 'no' )
			$selected = jQuery('li a[href$="' + path + '"]', this).parent('li');
			
		// if still no match, this may be a relative link match 
		if ($selected.length == 0 && o.startItem == 'no')
			$selected = jQuery('li a[href$="' +location.pathname.substring(location.pathname.lastIndexOf('/')+1)+ location.search+location.hash + '"]', this).parent('li');

		// no default selected element matches worked, 
		// or the user specified an index via startItem
		if ($selected.length == 0 || o.startItem != 'no') {
			// always default to first item, if no startItem specified.
			if (o.startItem == 'no') o.startItem = 0;
			$selected = jQuery($li[o.startItem]);
		}
		// set up raw element - this allows user override by class .selectedLava on load
		ce = jQuery('li.selectedLava', this)[0] || jQuery($selected).addClass('selectedLava')[0];

		// add mouseover event for every sub element
		$li.mouseenter(function() {
			if (jQuery(this).hasClass('homeLava')) {
				ce = jQuery(this)[0];
			}
			move(this);
		});

		$back = jQuery('<li class="backLava"><div class="leftLava"></div><div class="bottomLava"></div><div class="cornerLava"></div></li>').appendTo(this);
		
		// after we leave the container element, move back to default/last clicked element
		jQuery(this).mouseleave( function() {
			if (o.autoReturn) {
				if (o.returnHome && $home) {
					move($home[0]);
				}
				else if (o.returnDelay) {
					if(delayTimer) clearTimeout(delayTimer);
					delayTimer = setTimeout(function(){move(null);},o.returnDelay + o.speed);
				}
				else {
					move(null);
				}
			}
		});

		$li.click(function(e) {
			if (o.setOnClick) {
				jQuery(ce).removeClass('selectedLava');
				jQuery(this).addClass('selectedLava');
				ce = this;
			}
			return o.click.apply(this, [e, this]);
		});

		// set the starting position for the lavalamp hover element: .back
		if (o.homeTop || o.homeLeft)
			$back.css({ left:o.homeLeft, top:o.homeTop, width:o.homeWidth, height:o.homeHeight });
		else
			$back.css({ left: ce.offsetLeft, top: ce.offsetTop, width: ce.offsetWidth, height: ce.offsetHeight });


		function move(el) {
			if (!el) el = ce;
			// .backLava element border check and animation fix
			var bx=0, by=0;
			if (!jQuery.browser.msie) {
				bx = ($back.outerWidth() - $back.innerWidth())/2;
				by = ($back.outerHeight() - $back.innerHeight())/2;
			}
			$back.stop()
			.animate({
				left: el.offsetLeft-bx,
				top: el.offsetTop-by,
				width: el.offsetWidth,
				height: el.offsetHeight
			}, o.speed, o.fx);
		};
	});
};
})(jQuery);

}