jQuery.easing.easeOutLessBack = function (x, t, b, c, d, s) {
	s = 1.2; /* Change this number to change the amount of swing "back" */
	return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
};

$j(document).ready(function(){
    $j('#menu_items').lavaLamp({ fx: 'easeOutLessBack', speed: 550 });
});

/**
 * LavaLamp - A menu plugin for jQuery with cool hover effects.
 * @requires jQuery v1.1.3.1 or above
 *
 * http://gmarwaha.com/blog/?p=7
 *
 * Copyright (c) 2007 Ganeshji Marwaha (gmarwaha.com)
 * Dual licensed under the MIT and GPL licenses:
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 *
 * Version: 0.2.0
 * Requires Jquery 1.2.1 from version 0.2.0 onwards. 
 * For jquery 1.1.x, use version 0.1.0 of lavalamp
 */

/**
 * Creates a menu with an unordered list of menu-items. You can either use the CSS that comes with the plugin, or write your own styles 
 * to create a personalized effect
 *
 * The HTML markup used to build the menu can be as simple as...
 *
 *       <ul class="lavaLamp">
 *           <li><a href="#">Home</a></li>
 *           <li><a href="#">Plant a tree</a></li>
 *           <li><a href="#">Travel</a></li>
 *           <li><a href="#">Ride an elephant</a></li>
 *       </ul>
 *
 * Once you have included the style sheet that comes with the plugin, you will have to include 
 * a reference to jquery library, easing plugin(optional) and the LavaLamp(this) plugin.
 *
 * Use the following snippet to initialize the menu.
 *   $(function() { $(".lavaLamp").lavaLamp({ fx: "backout", speed: 700}) });
 *
 * Thats it. Now you should have a working lavalamp menu. 
 *
 * @param an options object - You can specify all the options shown below as an options object param.
 *
 * @option fx - default is "linear"
 * @example
 * $(".lavaLamp").lavaLamp({ fx: "backout" });
 * @desc Creates a menu with "backout" 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
 * $(".lavaLamp").lavaLamp({ click: function(event, menuItem) { return false; } });
 * @desc You can supply a callback to be executed when the menu item is clicked. 
 * The event object and the menu-item that was clicked will be passed in as arguments.
 */
(function($) {
$j.fn.lavaLamp = function(o) {
    o = $j.extend({ fx: "linear", speed: 500, click: function(){} }, o || {});

    return this.each(function() {
        var me = $j(this), noop = function(){},
            $back = $j('<li class="lavaback hide"><div class="lavaleft"></div></li>').appendTo(me),
            $li = $j("li", this), curr = $j("li.current", this)[0];

        $li.not(".back").hover(function() {
            move(this);
        }, noop);

        $j(this).hover(noop, function() {
            move(curr);
        });

        $li.click(function(e) {
            setCurr(this);
            return o.click.apply(this, [e, this]);
        });
        
        // window.setTimeout(function(){
            setCurr(curr);
        // }, 500);

        function setCurr(el) {
            if (el) {
                $back.css({ "left": el.offsetLeft+"px", "width": el.offsetWidth+"px" }).show();
                curr = el;
            } else {
                $back.show().css({ 'opacity': 0 });
            }
        };

        function move(el) {
            $back.dequeue();
            
            if (el) {
                if ($back.css('opacity') == '0') {
                    $back.css({
                        width: el.offsetWidth,
                        left: el.offsetLeft
                    }).animate({ opacity: 1 }, o.speed, o.fx);
                } else {
                    $back.animate({
                        width: el.offsetWidth,
                        left: el.offsetLeft,
                        opacity: 1
                    }, o.speed, o.fx);
                }
            } else {
                $back.animate({ opacity: 0 }, o.speed, o.fx);
            }
        };

    });
};
})(jQuery);