// JavaScript Document
function play(){
	var obj = document.getElementById("Layer1");
	//alert(obj.style.top);
	if(null == obj) return;
	var mytop,tops;
	var delta=0.05,tops = 300;
	mytop = parseInt(obj.style.top);
	if((document.documentElement.scrollTop + tops) != mytop){
		var dy=(document.documentElement.scrollTop+tops-mytop)*delta;
		dy=(dy>0?1:-1)*Math.ceil(Math.abs(dy));		
		obj.style.top = (mytop + dy) + "px";
	}
}		
setInterval('play()',10);