function now() {

    return (new Date).getTime();

}

jQuery.fx.prototype.custom = function( from, to, unit ) {

    this.startTime = now();

    this.start = from;

    this.end = to;

    this.unit = unit || this.unit || "px";

    this.now = this.start;

    this.pos = this.state = 0;



    var self = this;

    function t( gotoEnd ) {

        return self.step(gotoEnd);

    }



    t.elem = this.elem;



    if ( t() && jQuery.timers.push(t) && !jQuery.fx.prototype.timerId ) {

        //timerId = setInterval(jQuery.fx.tick, 13);

        //jQuery.fx.prototype.timerId = setInterval(jQuery.fx.tick, 50);

        jQuery.fx.prototype.timerId = setInterval(jQuery.fx.tick, 90);

    }

}