(function($) {
$.fn.lavaLamp = function(o) {
o = $.extend({ fx: "backout", 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).stop(this, "fx"); }
).animate({
width: el.offsetWidth,
left: el.offsetLeft
}, o.speed, o.fx);
};

});
};
})(jQuery);