[Robert9]

ok. Here we go:

find in private.php this line:

if ($what=="delete") {

then substitute the whole block till // end while
with this code.

   if ($what=="delete") {
    if (is_array($privatemessage)) {
  while(list($key,$val)=each($privatemessage)) {
            // for every pm get the attachmentid first !
            $ata = array(); $atas = array();
            echo "SELECT attachmentid FROM privatemessage WHERE privatemessageid=".intval($key)." AND userid=$bbuserinfo[userid] LIMIT 1";
            $ata = $DB_site->query_first("SELECT attachmentid FROM privatemessage WHERE privatemessageid=".intval($key)." AND userid=$bbuserinfo[userid]");
            // then look if there are more than one
            if ($ata[0] != '') {
                $ataid = $ata[0];
                // Count if there are more than one !
                $atas = $DB_site->query_first("SELECT COUNT(*) FROM privatemessage WHERE attachmentid = $ataid");
                echo "<br>SELECT COUNT(*) FROM attachment WHERE attachmentid = $ataid";
                // If there is only 1, delete it !
                if ($atas[0] == '1') {
                    $atasid = $atas[0];
                    echo"<br>$atas[0]<br>DELETE FROM attachment WHERE attachmentid = $ataid";
                    $DB_site->query("DELETE FROM attachment WHERE attachmentid = $ataid");
                } // else make error message !
            } 
  //      $DB_site->query("DELETE FROM privatemessage WHERE privatemessageid=".intval($key)." AND userid=$bbuserinfo[userid]");     
      } //end while

Im no programer at all, maybe something to improve ?