problem with my recursive function

[p80 <p80@xxxxxxx>]

I'm trying to display messages on my forum recursively, each message can 
have answers, the id of the parent post is in parentmessageid, the problem is 
that it only displays post that don't have answers ie post that have 
parentmessageid null
 /* here is my table: 
 +----+-------+-----------------+ 
 | id | title | parentmessageid | 
 +----+-------+-----------------+ 
 |  1 | a    |            NULL | 
 |  2 | b    |            NULL | 
 |  3 | repa  |              1 | 
 +----+-------+-----------------+ 
 as an example I only get 1 and 2
 */

function DisplayThread($realparentid="") {
$sql="select id,title,parentmessageid from message where parentmessageid";
  if ( $realparentid !== "" ) {
    //Root message do not have the ParentMessageID set
     $sql.="=$realparentid";
  } else
   $sql.=" IS NULL";

  $sql.=" ORDER BY id ASC";
$Reply = false; //Did we find any messages
$query=mysql_query($sql);
while($row=mysql_fetch_array($query)){
$Reply = true; //Found at least one message
$parentid=$row['0'];
$title =$row['1'];
$Result.="$title<br />$sql<br />$parentid<br />";
DisplayThread("$parentid");
}

  //Clear the statement handle
  mysql_free_result($query);

  if ($Reply) {
    //At least one message was processed
    return $Result;
  } else
    return "";
}

echo DisplayThread();

thx in advance

Pat
ps:you can check it out there: 
http://www.hashmysql.org/paste/viewentry.php?id=249

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