我想做一个屏保性质的东东！

//下边这个是以三秒为一个间隔！<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html>
<head>
<title>Untitled</title>
<Script language="javascript">
function fncMouseAction(val)
{
if (val=="0")
{id=window.setTimeout("alert('123')",3000);}
else
{
window.clearTimeout(id);
id=window.setTimeout("alert('123')",3000);
}
}
//-->
</Script>
</head><body onload="fncMouseAction('0');" onMouseMove="fncMouseAction('1');">Hello World!</body>
</html>