Submit disabled hakkında

<table border="0" cellspacing="5" cellpadding="0">
	   <form method="POST" name="myform" action="test/cevap.php" >
        <tr>
          <td valign="top" align="left"><strong><small><font face="Verdana">Soru: </font></small></strong></td>
          <td>Istiklal marsi sairimizkimdir? </td>
        </tr>
        <tr>
          <td><div align="center"></div></td>
          <td align="center"><div align="left"><p>
		  <input type="submit" value="cevab [A]" name="action">
		  <input type="submit" value="cevab [B]" name="action">
		  <input type="submit" value="cevab [C]"  name="action" >
		  <input type="submit" value="cevab [D]"  name="action" >
		  </div></td>
        </tr>   </form>
      </table>

<script language="javascript">
function butonlarikapat(){
document.myform.sec1.disabled=true;
document.myform.sec2.disabled=true;
document.myform.sec3.disabled=true;
document.myform.sec4.disabled=true;
}
</script>
<table border="0" cellspacing="5" cellpadding="0"> 
	<form method="POST" name="myform" action="http://www.sitemedya.com/" onsubmit="javascript:butonlarikapat()" target="_blank"> 
    <tr> 
		<td valign="top" align="left"><strong><small><font face="Verdana">Soru: </font></small></strong></td> 
		<td>Istiklal marsi sairimizkimdir? </td> 
	</tr> 
    <tr> 
    	<td><div align="center"></div></td> 
        <td align="center"><div align="left"><p> 
			<input name="sec1" type="submit" value="cevab [A]"> 
			<input name="sec2" type="submit" value="cevab [B]"> 
			<input name="sec3" type="submit" value="cevab [C]"> 
			<input name="sec4" type="submit" value="cevab [D]"> 
		</div></td> 
	</tr>
	</form> 
</table>