(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").mouseover(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);