Varför fungerar inte denna validering?

Detta är innanför HEAD taggen

<script language="Javascript">
function kolla() {
if (document.name.email.value.length == 0) {
alert("Igen ruta får vara tom");
return false;
} else
return true;
}
</script>

Sen själva formuläret.

<table width="140" border="0" cellspacing="0" cellpadding="0" height="350" background="stortavla_kilroy.gif">
  <td valign="top"> 
    <form name="form1" method="post" action="posting.asp" onSubmit="kolla();">
      <div align="right"> 
        <table width="82" border="0" cellspacing="0" cellpadding="0" height="86">
          <tr> 
            <td background="" height="85"> 
              <div align="right"> 
                <input type=image src=sign.jpg border=0 alt="Sign up" name="image">
                &nbsp;</div>
              <div align="right"> 
                <input type="text" name="name" size="9" style="font-size:12px;">
                &nbsp;<br>
                <input type="text" name="email" size="9" style="font-size:12px;">
                &nbsp;</div>
            </td>
          </tr>
        </table>
      </div>
    </form>
  </td>
</table>

Har du någon submit-knapp?

------------------
/A.S