js

<script language="JavaScript">
function test() {
for (i=0;i<document.vote.rbresult.length;i++) {
if (document.vote.rbresult[i].checked) return true;
}
alert('请选择！')
return false
}
</script>
<table width="100%" border="0" cellspacing="0" cellpadding="0" align="center">
  <tr>
    <form name="vote" method="post"  action="vote/result.asp"  
onSubmit="windowOpener('')" target=surveywin>
        <td align="center">
        <font color="#CC0000"><b> </b></font> 
        <table width="100%" border="0" cellspacing="0" cellpadding="0" align="center">
          <tr> 
            <td align="left" class="font9"><strong><font color="#CC0000">调查</font></strong>：请您协助填写此问题？</td>
          </tr>
          <tr> 
            <td align="center" class="font9"><font color="#CC0000"><b> 
              <input type="radio" name="rbresult" value="fgood">
              </b></font>1用户<font color="#CC0000"><b> 
              <input type="radio" name="rbresult" value="fmid">
              </b></font>2用户<font color="#CC0000"><b> 
              <input type="radio" name="rbresult" value="fbad">
              </b></font>3用户 
              <input type="submit" name="Submit" value=" 投票 " class="boxfont" onClick="return test()"></td>
          </tr>
        </table> 
    </td></form>
  </tr>
</table>