function checkform ( form )
{

// ** START **
if (form.user.value == "") {
document.getElementById("error_message").innerHTML = 'ERROR: Please enter your username and submit the form again.';
document.getElementById("error_message").style.display = "block";
form.user.focus();
return false ;
}

if (form.pass.value == "") {
document.getElementById("error_message").innerHTML = 'ERROR: Please enter your password and submit the form again.';
document.getElementById("error_message").style.display = "block";
form.pass.focus();
return false ;
}

// ** END **
return true ;
}