jQuery.fn.lavaLamp = function(options) {

    this.each(function() {
        new LavaLamp(this, options);
    });
    return this;
};

function LavaLamp(ele, options) {

    this.$root = jQuery(ele);
    this.options = jQuery.extend(LavaLamp.DEFAULTS, options || {});
    this._init();
}

jQuery.extend(LavaLamp, { DEFAULTS: { fx: "linear", speed: 500, click: function() { } },
get: function(ele) {
return jQuery.data(ele, 'active.lavalamp');
}
});

LavaLamp.prototype = { setCurr: function(ele) {
    ele = this._resolveElement(ele);
    this.$back.css({ "left": ele.offsetLeft + "px", "width": ele.offsetWidth + "px" }); this.curr = ele;},
    _init: function() {
        var self = this; this.$li = this.$root.find('li').hover(function() {
        self._move(this);
    },
     function() { }).click(function(evt) {
    self.setCurr(this);
    return self.options.click.apply(this, [evt, this]);
});

     this.curr = this.$root.find('li.current')[0] || this.$li.eq(0).addClass('current')[0];
     this.$root.hover(function() { }, function() { self._move(self.curr) });
     this.$back = jQuery('<li class="back"><div class="left"></div></li>').appendTo(this.$root);
     this.setCurr(this.curr); this.$root.data('active.lavalamp', this);
 },
 _move: function(ele) {
     ele = this._resolveElement(ele);
     this.$back.each(function() {
     jQuery(this).dequeue("fx");
 }).animate({ width: ele.offsetWidth, left: ele.offsetLeft },
     this.options.speed, this.options.fx);
},
_resolveElement: function(thing) {
if (typeof thing == 'number') {
    return this.$li.eq(thing)[0];
}
else if (typeof thing == 'string') {
return this.$li.filter(thing)[0];
}
else {
    return thing;
}
} 
     };