<script language="JavaScript">

<!--

function validateLogin(){

var strUserID = document. frmLogin. txtUserID.value;

var strPassword = document. frmLogin. txtPassword.value;

var primeInUserID= document. frmLogin. txtUserID.value.indexOf("'");

var primeInPassword= document. frmLogin. txtPassword.value.indexOf("'");

if (strUserID ==""){

alert("请您输入用户账号！");

return false;

}

if (strPassword ==""){

alert("请输入密码！");

return false;

}

if (primeInUserID !=-1){

alert("用户账号中不能包含撇号！");

return false;

}

if (primeInPassword !=-1){

alert("密码中不能包含撇号！");

return false;

}

}

-->

</script>

提交表单时运行“验证用户登录信息”的函数

<form method="post" name="frmLogin" action="verifyID.asp"

 onSubmit="javaScript: return validateLogin();">