function ceng()
{
document.write("<div  id=ceng style=z-index:100;left:2px;top:50px;width:109px;height:77px;position:absolute>");
document.write("<a title=点击书目下载 href=down.asp?id=全国各类成人高考复习教材书目 ><img border=0 src=images/shumu.gif /></a>");
document.write("</div>");
}
//ceng()
function move()
{

document.getElementById("ceng").style.left=2;
document.getElementById("ceng").style.top=document.documentElement.scrollTop+50;
}
//setInterval("move();",100);