function checkpw(loginform)
{
var flag = false;
if  (loginform.UserName.value == "")
    {
    alert("Please enter your user name.");
    loginform.UserName.focus();
    flag = true;
    }
if  (loginform.Password.value == "")
    {
    alert("Please enter your password.");
    loginform.Password.focus();
    flag = true;
    }
if  (flag)
    {
    return false;
    }
    else
        {
        return true;
        }
}