aspにおけるcheckboxの使い方

<tr>
  <td width="12%" height="25" align="right">       ：</td>
  <td width="88%"><input name="ShowIndex" type="checkbox" value="1">
</tr>

<tr>
  <td width="12%" height="25" align="right">       ：</td>
  <td width="88%"><input name="ShowIndex" type="checkbox" value="1" <%'if rs("ShowIndex")=true then response.Write "checked" end if%>>
</tr>

ShowIndex=Request.Form("ShowIndex")   '