function validateLogin() {
    //user id
    if (verifyField(getField("txtUserID"), "txtUserID", 0) == false) {
        alert("Please enter a user name.");
        setRequiredField("txtUserID");
        document.getElementById("txtUserID").focus();
        return false;
    } else {
        document.getElementById("txtUserID").className = "";
    }

    //password
    if (verifyField(getField("txtPassword"), "txtPassword", 0) == false) {
        alert("Please enter a password.");
        setRequiredField("txtPassword");
        document.getElementById("txtPassword").focus();
        return false;
    } else {
        document.getElementById("txtPassword").className = "";
    }

	return true;
}