<script language="javascript">
function getURL(url)
{
var xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
xmlhttp.open("GET",url,false);
xmlhttp.send();
if (xmlhttp.readyState==4)
alert((xmlhttp.Status==200)?"存在":"不存在");
}
//user like this:
getURL("http://localhost/Web_Calendar_30.rar");
</script>