滑动广告火狐关闭不了

Question

滑动广告火狐关闭不了， IE上面没有问题。 不清楚原因// JavaScript Document
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("lovexin12").style.top=parseInt(document.getElementById("lovexin12").style.top)+percent+"px";lastScrollY=lastScrollY+percent; 
//alert(lastScrollY);
}
suspendcode12="<DIV id=\"lovexin12\" style='right:22px;POSITION:absolute;TOP:69px;'><a href='http://127.0.0.1/index.php?app=cart' target='_blank'><img border=0 src=http://127.0.0.1/external/cart/1.gif><br><a href=JavaScript:; onclick=\"lovexin12.style.visibility='hidden'\"><img border=0 src=http://127.0.0.1/external/cart/close.gif></a></div>"
document.write(suspendcode12); 
window.setInterval("heartBeat()",1);