iki alanı birden kontrol ettirmek

<script language="JavaScript">
<!--
function ValidateForm(eForm) {
  if ("" == eForm.user.value)
  {
   window.alert("Lütfen Bir Rumuz Giriniz"); 
   return false;
  
  }
if (eForm.user.value.length<4 || eForm.user.value.length>16)
{
 window.alert("Rumuz En az 4 en fazla 16 karakter olmalıdır"); 
 return false;
}

}
//-->
function clearText(thefield){
if (thefield.defaultValue==thefield.value)
thefield.value = ""
} 
</script>
<?PHP
if($_POST)
{
$user =addslashes($_POST['user']);
$query ="select * from user where user='$user' ";
$islem=mysql_query($query);
$sonuc=mysql_num_rows($islem);
 if($sonuc>0)
 {
 echo"
 <tr>
  <td width=\"100\" align=\"center\" class=\"siyah\"><b>$user</b></td>
  <td width=\"100\" class=\"kirmizi\">Kullanimda !</td>
 </tr>
 <tr>
  <td colspan=\"2\" align=\"center\"><a href=\"rumuz_kontrol.php\" target=\"_self\">Yeni Arama Yap</a></td>
 </tr>
 ";
 }
 else
 {
 echo"
 <tr>
  <td width=\"100\" align=\"center\" class=\"siyah\"><b>$user</b></td>
  <td width=\"100\" class=\"mavi\">Kullanilabilir !</td>
 </tr>
 <tr>
  <td colspan=\"2\" align=\"center\"><a href=\"rumuz_kontrol.php\" target=\"_self\">Yeni Arama Yap</a></td>
 </tr>
 ";
 }
}
else
{
echo"
<form name=\"eForm\" onsubmit=\"return ValidateForm(eForm);\" action=\"rumuz_kontrol.php\" method=\"POST\">
<tr>
 <td width=\"100\"><input name=\"user\" type=\"text\" class=\"siyah\"style=\"width:100;height:18;\"></td>
 <td width=\"100\"><input type=\"submit\" class=\"siyah\" value=\"Kontrol Et\"  style=\"width:100;height:18;\"></td>
</tr>
</form>
";
}
?>
</table>
</body>
</html>