(function($) {
$.fn.lavaLamp = function(o) {
    o = $.extend({ fx: "linear", speed: 500, click: function() { } }, o || {});
    return this.each(function() {
        var b = $(this), noop = function() { },
        $back = $('<li class="back"><div class="left"></div></li>').appendTo(b),
        $li = $("li", this), curr = (($("li.current_page_ancestor", this)[0] ||
                    $("li.current-cat", this)[0]) ||
                    $("li.current_page_item", this)[0]) ||
                    $($li[0]).addClass("current_page_item")[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(a) {
            $back.css({ "left": a.offsetLeft + "px", "width": a.offsetWidth + "px" });
            curr = a
        };

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