<script language="JavaScript">
<!--
function f(){
var req =new ActiveXObject("Microsoft.XMLHTTP");
req.open("GET","192.asp?username="+username.value, true);
req.onreadystatechange = function(){
if (req.readyState == 4) { 
	if (req.status == 200) { 
		if (req.responseXML.documentElement.tagName == 'SUCCESS')
		{
		alert("您输入的用户名没有重复,可以继续注册！")
		} 
		else
		{
		alert("您输入的用户名有重复,请选择其他用户名！")
		}
	}
}
}
req.send(null);    // 发送请求
} 
//-->
</script>
<p>用户注册</p>
标识：<input id=username type=text>&nbsp;<input type=button value="检测用户名" onclick="javascript:f()"><br>
口令：<input id=pwd type=password><br>
<input type=button value="确定">