/**

 * 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);