function ValidateFields() {
    if (document.getElementById("ctl00_txtUserID").value == "") {
        alert("Please enter the User id.")
        document.getElementById("ctl00_txtUserID").focus();
        return false;
    }
    else if (document.getElementById("ctl00_txtPassword").value == "") {
        alert("Please enter the password.")
        document.getElementById("ctl00_txtPassword").focus();
        return false;
    }
    else {
        return true;
    }
}