<table   width="301"   border="1"   cellpadding="5"   cellspacing="0"   id="tab1">   
      <tr>   
          <td id="td1"  width="47">1</td>   
          <td   width="47">2</td>   
          <td   width="47">3</td>   
          <td   width="47">4</td>   
          <td   width="51">5</td>   
      </tr>  
  </table>
<input type="button" onclick="td1.style.display='none'">