gistfile1.js

animation = {
    amount: 20,
    ready: true,
    anim: function(dir, el) {
        amount = dir * this.amount;
        if (this.ready) {
            this.ready = false;
            el.animate({
                left: '+=' + amount,
                top: '+=' + amount
            }, function() {
                this.ready = true;  // this seems to be out of scope.. 
                                    // how can I set the 'ready' property of 'animation' 
                                    // in this callback function?
            });
        }
    }
}