odosiela len prvý form

<script type="text/javascript">
 function subForm(str)
 {
 if (str=="")
   {
   document.getElementById("txtHint").innerHTML="";
   return;
   }
 if (window.XMLHttpRequest)
   {// code for IE7+, Firefox, Chrome, Opera, Safari
   xmlhttp=new XMLHttpRequest();
   }
 else
   {// code for IE6, IE5
   xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
   }
 xmlhttp.onreadystatechange=function()
   {
   if (xmlhttp.readyState==4 && xmlhttp.status==200)
     {
     document.getElementById("txtHint").innerHTML=xmlhttp.responseText;
     }
   }
 meno = document.getElementById("meno").value;
 url_image = document.getElementById("url_image").value;
 popis = document.getElementById("popis").value;
 var queryString = "?q=" + str + "&meno=" + meno + "&image=" + url_image + "&popis=" + popis;
 xmlhttp.open("GET","postava.php" + queryString,true);
 xmlhttp.send();
 }
 </script>

<?php
  $id = $_GET["id"];

  if($id==""){
    echo "chyba";
  }

  include("config.php");
  login();
 
  $conn = mysql_connect($mysql_server,$user_db,$pass_db) or die(mysql_error());
  $db = mysql_select_db($mysql_db) or die(mysql_error());
 
  $query = mysql_query("SELECT id,obsadenie FROM serialy WHERE id=$id");
  $row = mysql_fetch_array($query);
 
  $obsadenie = $row["obsadenie"];
 
  $ex = explode("<br>",$row["obsadenie"]);

  for($i=0;$i<count($ex);$i++) {
  $query2 = mysql_query("SELECT * FROM postavy WHERE serial=$id AND meno='".$ex[$i]."'") or die(mysql_error());
  $row2 = mysql_fetch_array($query2);
  ?>
 
<br>
<form>
<input type="hidden" id="meno" name="meno" value="<?=$ex[$i]?>">
<input type="text" id="url_image" name="url_image" value="<?=$row2["image"]?>">
<br>
<textarea rows="2" cols="20" id="popis"><?=$row2["popis"]?></textarea>
<br>
<img src="button.jpg" id="<?=$row["id"]?>" onclick="subForm(this.id)">
</form>
<br> 
 
  <? } ?>
<div id="txtHint"><b>výsledok ajaxu</b></div>