return '<img src="' . $link . '" border="0" alt="" />';

global $post;
$aaa = $post['title'];
$hhh = "showthread.php?$session[sessionurl]t=$post[threadid]" ;
return '<a title="' .  $aaa . '" href="' .  $hhh . '"><img src="' .  $link . '" border="0" alt="' .  $aaa . '" /></a>';

global $post;
$aaa = $post['title'];
return '<img src="' .  $link . '" border="0" alt="' .  $aaa . '" />';