<script LANGUAGE="JavaScript">
<!--
flag2=0
function checkpwd(){
if (flag2== 3){
alert("您已经无权在此输入密码！")
window.location.href = "http://www.sina.com.cn"
}
else
{
if((document.form1.username.value == "zt")&&(document.form1.pwd.value == "1111"))
{
alert("验证成功！")
return true
}
else{
flag2=flag2+1
alert("您输入的用户名或密码错误，请重新输入！")
return false
}
}
}
//-->
</script>
</head>
<body>
<form name="form1" method="post">
姓名：<input name="username" type="text"><br>
密码：<input name="pwd" type="password"><br>
<input type="button" name="submit" value="确定" onclick="checkpwd();"><br>您输入密码3次错误将自动进入新浪网
</form>
</body>