<script language="JavaScript">
<!--
function logout()
{
ht = document.getElementsByTagName("body");
ht[0].style.filter = "progid:DXImageTransform.Microsoft.BasicImage(grayscale=1)"; // 定义body的灰度
errstr="你确定要退出吗?\n\n";
if(confirm(errstr)){
return true
}else{
ht[0].style.filter = "";
return false;
}
}
-->
</script>
<body>
<a href="#" onclick="logout();"><b>退出系统</b></a>
</body>