Problem med foreach selection!

Er en, som ved, hvordan man kan finde den rigtige image_id til at blive selected? For hver gang jeg updater, så ryger det forvalgte image_id.

<?php
  $link = mysql_connect("localhost", "designunltdd", "6J6Md9bb")
    or die("Could not connect: " . mysql_error());
  mysql_select_db('designunltddk_shop', $link)
    or die ( mysql_error());
  $imagessql = "SELECT * FROM images";
 
  $result = mysql_query($imagessql)
    or die("Invalid query: " . mysql_error());
  while ($row = mysql_fetch_array($result)) {
    $images[$row['image_id']] = $row['image_caption'];
  }

  switch ($_GET['action']) {
    case "edit":
      $productssql = "SELECT * FROM products
                  WHERE products_prodnum = '" . $_GET['id'] . "'";
      $result = mysql_query($productssql)
        or die("Invalid query: " . mysql_error());
      $row = mysql_fetch_array($result);
      $products_imageurl = $row['products_imageurl'];
      break;
     
    default:
      $products_imageurl = "";
      break;
  }
?>
        <select name="products_imageurl" size="1">
          <option value="<?php echo $products_imageurl; ?>" selected>Vælg et billede...</option>
          <?php
  foreach ($images as $image_id => $image_caption) {
    if ($image_id == $products_imageurl) {
      $selected = " selected";
    } else {
      $selected = "";
    }
?>
          <option value="<?php echo $image_id; ?>.jpg"<?php
        echo $selected; ?>><?php echo $image_id; ?>.jpg</option>
          <?php
  }
?>
        </select></td>
      <td colspan="2" valign="top"><?php
  $link = mysql_connect("xxxxx", "xxxxx", "xxxxx")
    or die("Could not connect: " . mysql_error());
  mysql_select_db('xxxxx_shop', $link)
    or die ( mysql_error());
  $imagessql = "SELECT * FROM images";
 
  $result = mysql_query($imagessql)
    or die("Invalid query: " . mysql_error());
  while ($row = mysql_fetch_array($result)) {
    $images[$row['image_id']] = $row['image_caption'];
  }

  switch ($_GET['action']) {
    case "edit":
      $productssql = "SELECT * FROM products
                  WHERE products_prodnum = '" . $_GET['id'] . "'";
      $result = mysql_query($productssql)
        or die("Invalid query: " . mysql_error());
      $row = mysql_fetch_array($result);
      $products_thumbnailimageurl = $row['products_thumbnailimageurl'];
      break;
     
    default:
      $products_thumbnailimageurl = "";
      break;
  }
?>
        <select name="products_thumbnailimageurl" size="1">
          <option value="<?php echo $products_thumbnailimageurl; ?>" selected>Vælg et billede...</option>
          <?php
  foreach ($images as $image_id => $image_caption) {
    if ($image_id == $products_thumbnailimageurl) {
      $selected = "$products_thumbnailimageurl";
    } else {
      $selected = "";
    }
?>
          <option value="<?php echo $image_id; ?>.jpg"<?php
        echo $selected; ?>><?php echo $image_id; ?>.jpg</option>
          <?php
  }
?>
                        </select>