function hidekefu(){
    obj=document.getelementbyid("kefu_pannel");
    obj.style.display='none';
}
lastscrollyser = 0;
function heartbeatser()
{
    diffy= document.body.scrolltop+document.documentelement.scrolltop;
    obj=document.getelementbyid("kefu_pannel");
    percent =1*(diffy-lastscrollyser);
    if(percent>0)
    {
         percent = math.ceil(percent);
     }
    else
    {
         percent = math.floor(percent);
    }
    obj.style.top=(parseint(obj.style.top,10)+percent)+"px";
    lastscrollyser = lastscrollyser+percent;
}
window.setinterval("heartbeatser()",1);