function toggler(el, attributes, duration, method) {
		this.init(el, attributes, duration, method);
		// reverse the attributes so it works as expected the first time
		// possibly a better way to do this is to register onComplete and
		// toggle values.
		this.switchAttrs();
	}
   
	toggler.prototype = new YAHOO.util.Anim();
	toggler.prototype.toggle = function() {
		this.switchAttrs();
		this.animate();
	};

	/* swaps the from and to values or negates the by value.  TODO possibly
	 * check the from and to values to see if one is missing and use the
	 * current value of this trait to fill in the missing value. */ 
	toggler.prototype.switchAttrs = function() {
		for (attr in this.attributes) {
			if (this.attributes[attr].by) {
				this.attributes[attr].by = -(this.attributes[attr].by);
			} else {
				var tmp = this.attributes[attr].from;
				this.attributes[attr].from = this.attributes[attr].to;
				this.attributes[attr].to = tmp;
			}
		}
	};