function HelpDesk()
{
    if(document.getElementById("txtUserName").value == "")
    {
        alert("Enter User Name!");
        document.getElementById("txtUserName").focus();
        return false;
    }
    else if(document.getElementById("txtPassword").value == "")
    {
        alert("Enter Password!");
        document.getElementById("txtPassword").focus();
        return false;
    }
    return true;
}