<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<style type="text/css">
.bg1 { background:#eee;}
.bg2 { background:#ccc;}
</style>
<SCRIPT LANGUAGE="JavaScript">
<!--
function SetBackground()
{
var obj = document.getElementsByTagName("body")[0];
if (obj.className == "bg1") obj.className = "bg2";
else obj.className = "bg1";
}
window.setInterval(SetBackground,1000);
//-->
</SCRIPT>
</HEAD>
<BODY>
</BODY>
</HTML>
修改.bg1 { background:#eee;} .bg2 { background:#ccc;} 背景改成你的图片就行了
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