Prova a mettere cos:
codice:
                      <table cellspacing="0" cellpadding="0" border="0" bordercolor="#FF0000" height="100%" width="100%">
                           <tr>
                               <td height="100%" width="15%" bgcolor="#FF0000">
                               <td height="100%" bgcolor="#000000">                                                              
                               <td height="100%" width="15%" bgcolor="#FF0000">
                           </tr>
                       </table>