function Login() {                       
    if(document.forms[0].login_name.value == "") {
        alert("Please fill in your login name");      
        document.forms[0].login_name.select();
        return;
    }
    if(document.forms[0].login_pwd.value == "") {
        alert("Please fill in your password");
        document.forms[0].login_pwd.select(); return;
    }
    document.forms[0].submit();
}