div colori random

[mybox]

  echo "<div style=\"background-color:#CC0000\">";
  echo "<p align=\"center\">";
  echo "In Stanza:";
  echo "</p>";
  echo "</div>";
         $inside=mysql_query("SELECT DISTINCT * FROM chatonline WHERE rid='".$rid."' and uid IS NOT NULL");
        
        while($ins=mysql_fetch_array($inside))
        {
          $unick = getnick_uid($ins[1]);
          $userl = "<a href=\"chat.php?action=prof2&amp;sid=$sid&amp;who=$ins[1]&amp;rid=$rid&amp;rpw=$rpw\">$unick</a>,";
          echo "$userl";
        } 

come posso mettere i bordi a questo blocco???senza mettere un css???