var lastScrollY=0;
//层随滚动条移动
function divFloat(){
    var diffY = 0;
    if (document.documentElement && document.documentElement.scrollTop)
        diffY = document.documentElement.scrollTop;
    else if (document.body)
        diffY = document.body.scrollTop
    else
        {/*Netscape stuff*/}
        
    percent = .1*(diffY-lastScrollY);
    if(percent>0)percent=Math.ceil(percent);
    else percent=Math.floor(percent);
    
    var onlineDiv = document.getElementById("onlineDiv");
    onlineDiv.style.top = parseInt(onlineDiv.style.top)+percent+"px";
    lastScrollY = lastScrollY+percent;
}
function online_out(element){
    element.className = 'online_out';
}

function online_over(element){
    element.className = 'online_over';
}
var tagStr = "<div id=\"onlineDiv\" style='top:220px;' class='online_out' onmouseover='online_over(this);' onmouseout='online_out(this);'></div>"
document.write(tagStr);