i have this form want to know all checked or not
if not give a message

<form name="form" method="post" action="tesekkur.asp" target="NewWin">
<table width="226" border="1">
  <tr>
    <td width="216"><p>futboloynamay#305; seviyormusunuz</p>

        <input name="cevap1" type="radio" value="1">
evet <input name="cevap1" type="radio" value="2">
Hay#305;r<input name="cevap1" type="radio" value="3">
Yorum yok </td>
  </tr>
  <tr>
    <td><p>En sevdi#287;iniz sinemac#305;<br>
      <br>
      <input name="cevap2" type="radio" value="1">
      Kevin spa
      <input name="cevap2" type="radio" value="2">
      Angelina <input name="cevap2" type="radio" value="3">
      Di#287;er</p>
      </td>
  </tr>
  <tr>
    <td><p>En sevdi#287;iniz sinema filmi<br>
            <br>
            <input name="cevap3" type="radio" value="1">
      T#305;TANIC
      <input name="cevap3" type="radio" value="2">
      Ba#351;ka</p></td>
  </tr>
  <tr>
    <td><div align="center">
       <input type=button onclick="openPopup(this.form);" value="Gönder">
    </div></td>
  </tr>

</table>
  </form>

is there a way to validate this form