Nejde update

$sql=mysql_query("SELECT * FROM domeny WHERE id='".$_GET["id"]."'");
      while($a=mysql_fetch_array($sql)) {
        $id_dom=$a["id"];
        $domena=$a["domena"];
        $mena=$a["mena"];
}

<form action ="index.php?page=uvodni_strana&page2=podstranky/pos_reg_dom&id=<?php echo $_GET["id"];?>" method="post">
Domena: <input type="text" name="domena" value="<?php echo $domena;?>"><br>
Mena: <select name="mena">
        <option value="CZK" >CZK
        <option value="SKK" >SKK
        <option value="EUR" >EUR
        <option value="USD" >USD
 <input type="submit" name="edit" value="Dale">
</form> 

if(isset($_GET['edit'])) {
         $edit_domeny = mysql_query("UPDATE domeny SET domena='$domena', mena='$mena', program='$program' WHERE id='".$id_dom."'");
}