双击鼠标左键来滚动背景，单击停止。

〈SCRIPT language=javascript〉
var currentpos,timer;
function initialize()
{
timer=setInterval("scrollwindow()",16);
}
function sc(){
clearInterval(timer);
}
function scrollwindow()
{
currentpos=document.body.scrollTop;
window.scroll(0,++currentpos);
if (currentpos != document.body.scrollTop)
sc();
}
document.onmousedown=sc
document.ondblclick=initialize
〈/SCRIPT〉