lastScrollY = 0;
function heartBeat(){ 
	var diffY;
	if (document.documentElement && document.documentElement.scrollTop)
		diffY = document.documentElement.scrollTop;
	else if (document.body)
		diffY = document.body.scrollTop
	else
	{/*Netscape stuff*/}
 
	//alert(diffY);
	percent=.1*(diffY-lastScrollY); 
	if(percent>0)percent=Math.ceil(percent); 
	else percent=Math.floor(percent); 

	document.getElementById("rightDiv").style["top"] = parseInt(document.getElementById("rightDiv").style["top"])+percent+"px";
	lastScrollY=lastScrollY+percent; 
//alert(lastScrollY);
}

//下面这段删除后，对联将不跟随屏幕//而移动。
window.setInterval("heartBeat()",1);