Insertar <tr> cada 3 ejecuciones

[erama]

tiene razón, ya lo solucione

$q = mysql_query("SELECT * FROM st_links WHERE catid='$cid' ORDER BY rand() LIMIT 14");
$contador=0;
while($result2 = mysql_fetch_array($q)){
$contador++;
if ($contador%4==1){$tr="<tr>"; } else {$tr="";}
$linkid = $result2["linkid"];
$date = date ("j/n");
$des = $result2["des"];
$catid = $result2["catid"];
$url = $result2["url"];


gracias