lastScrollY1=0;
function heartBeat1(){ 
    var diffY1;
    if (document.documentElement && document.documentElement.scrollTop)
        diffY1 = document.documentElement.scrollTop;
    else if (document.body)
        diffY1 = document.body.scrollTop
    else
        {/*Netscape stuff*/}
        
    //alert(diffY1);
    percent=.1*(diffY1-lastScrollY1); 
    if(percent>0)percent=Math.ceil(percent); 
    else percent=Math.floor(percent); 
    document.getElementById("openMail").style.top=parseInt(document.getElementById("openMail").style.top)+percent+"px";

    lastScrollY1=lastScrollY1+percent; 
//alert(lastScrollY1);
}

if(isOnline==1){
        var styleContent="<style type=\"text/css\"><!--.mail01{background:url(/images/mailBg01.gif) no-repeat; text-align:center;width:70px; padding:10px 13px 0 13px; height:77px;}.mail01 strong{font-size:12px;}.mail02{background:url(/images/mailBg02.gif) no-repeat; width:96px; height:60px;}--></style>";
       var recontent="";
       if(messageCount==0){
          recontent="<div class=\"mail02\" id=\"openMail\" style=\"left:5px;POSITION:absolute;TOP:793px;z-index:1000;height:60px\"></div>";
       }
       else{
       
          recontent="<div class=\"mail01\" id=\"openMail\" style=\"left:5px;POSITION:absolute;TOP:763px;z-index:1000;height:77px\"><strong><a href=\"/student/MyMessage.aspx\">收件箱（"+messageCount+"）</a></strong></div>";
	

       }
     
     document.write(styleContent+recontent); 
     document.getElementById("openMail").style.top=(window.screen.availHeight-document.getElementById("openMail").offsetHeight-170)+"px";
     window.setInterval("heartBeat1()",1);
}
else{
    var recontent="<div class=\"mail02\" id=\"openMail\" style=\"right:5px;POSITION:absolute;TOP:563px;display:none\"></div>";
    document.write(recontent);
}