How to show a module only to visitors?

[laminedj]

Hello,

I want to show a "Sign up" image in a module on right sidebar only to visitors and a "Welcome" message if it's a registered user.

I know I have to ad a PHP module on right sidebar ad php code.

I found this, as base of work, but I am still blocked

PHP Code:

<?php

if (is_member_of(vB5_User::get('usergroupid'), 6)) {
echo "Hi Admin";
} else {
echo "Hello!!!!!!";
}

?>

I am limited on php, little help would be very appreciated.

Regards

Laminedj