lastscrolly = 0;
function plug_qq(){
var diffy;
if (document.documentelement && document.documentelement.scrolltop)
diffy = document.documentelement.scrolltop;
else if (document.body)
diffy = document.body.scrolltop
else
{}
percent=.1*(diffy-lastscrolly);
if(percent>0)percent=math.ceil(percent);
else percent=math.floor(percent);
document.getelementbyid("plugqq").style.top = parseint(document.getelementbyid("plugqq").style.top)+percent+"px";
lastscrolly=lastscrolly+percent;

}
window.setinterval("plug_qq()",1);