html shop offers 3 in row

[Mauzim]

    if(count($offer_list['item']) > 0)
    {
      $main_content .= '<table cellspacing="2" cellpadding="2" width=30>';
      foreach($offer_list['item'] as $item)
      {
        $main_content .= '<td class="shop">
        <a class="shop" style="display: block;" href="/shop/item/id/'.$item['id'].'">
        <center><img src="item_images/'.$item['item_id'].'.gif"><br><font color="white"><b>'.$item['name'].'</font></b><font color="red"> <b> '.$item['points'].' points</font></b>';
        if(!$logged)
        {
          $main_content .= '<p><b><a href="/account">[Login to buy]</a></b>';
        }
        else
        {
  $main_content .= '<br><b><font size=1 color="white">Your points balance is: '.$user_premium_points;
          $main_content .= '<br><font color="white"> <fieldset class="shop"><legend>DESCRIPTION</legend>'.$item['description'].'</fieldset></font><br><font color="white"><b> [Click to buy] </b></font></form> </a></center></td>';
        }
        $main_content .= '';
      }
      $main_content .= '</tr></table>';
    }

how to make it like only 3 offers in row now i have one row and all offer is in 1 line