// implement flashing
	Element.implement({
		flash: function(to,from,reps,prop,dur) {
			//defaults
			if(!reps) { reps = 1; }
			if(!prop) { prop = 'background-color'; }
			if(!dur) { dur = 250; }
			//create effect
			var effect = new Fx.Tween(this, {
				duration: dur,
				link: 'chain'
			})
				//do it!
				for(x = 1; x <= reps; x++)
				{
					effect.start(prop,to,from).start(prop,from,to);
				}
			}
		});