['DELETE' sql statement in PHP]

I have the following script in one of my pages. It's in an include() file, and a part of my template managing system.

[code]if (!empty($newtemplate)) // if a request about a template has been sent
{
   $query = "SELECT * FROM templates";
   $test_template_data = mysql_query($query);
   if (!$test_template_data) die(sql_error());

  $test = 0;

   while($testdata = mysql_fetch_array($test_template_data))  // Testing to see if the requested template is registred
   {
     if ($testdata["templatename"] == $newtemplate)  // if template is found in sql database
     {
       switch ($action)
       {
        case 'change':   // change default template
         $query = "UPDATE admin SET template='" . $newtemplate ."' WHERE settingsid='1'";
         $test_update_default_template = mysql_query($query);
         if (!$test_update_default_template) die ('Cannot store settings');
         echo '<font class="message">Template has been changed!</font>';
         $test = 1;
        break;

        case 'del':   // delete template from sql table
         $delquery = "DELETE FROM templates WHERE templatename='" . $template_to_delete . "'";
         $del_template_test = mysql_query($delquery);
         if (!$del_template_test) die('Cannot delete template');
         echo '<font class="message">Template has been deleted!</font>';
         $test = 1;
        break;
        
        default:
        break;
       }
     }
   }
   if (!$test) echo '<font class="message">No such template!</font>';
}
[/code]

My problem is, I can't echo out anything in the 'del' case as long as the '$delquery' is not commented out...
The '$test' variable is not changed either.
The record in question is deleted in the sql table, though...

How can I make this work as intended?

Any help would be appreciated!