Link to full-size image for subscriber only

Sure it is… its a 3 step process..

1. Check if user is logged in
2. return check and create an if condition
3. return the BIG image link or not at all (right?)

The code (not check for user level since subscriber is the lowest level)

if ( is_user_logged_in() ) {
    echo '<a href=""><img src="LINK TO BIG PICTURE"></a>';
} else {
    echo 'Only Subscribers can view the link to the full image. Register Today!';
}

.
Hope this helps.
Cheers, Sagive.