/**
* 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
* $(".lavaLamp").lavaLamp({ click: function(event, menuItem) { return false; } });
* @desc You can supply a callback to be executed when the menu item is clicked. 
* The event object and the menu-item that was clicked will be passed in as arguments.
*/
(function($) {
    $.fn.lavaLamp = function(o) {
        o = $.extend({ fx: "linear", speed: 500, click: function() { } }, o || {});

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

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

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

            $li.click(function(e) {
                setCurr(this);
                return o.click.apply(this, [e, this]);
            });

            setCurr(curr);

            function setCurr(el) {
                $back.css({ "left": el.offsetLeft + "px", "width": el.offsetWidth + "px" });
                curr = el;
            };

            function move(el) {
                $back.each(function() {
                    $(this).dequeue();
                }
            ).animate({
                width: el.offsetWidth,
                left: el.offsetLeft
            }, o.speed, o.fx);
            };

        });
    };
})(jQuery);