ImageField: Remove Timestamp from Image URL?

Currently, when using ImageField to add an image to a node, a query string (in this case, the image's timestamp) is automatically appended to the image's URL. I have tried what quicksketch suggested in the "Image title doesn't match saved image name" issue, but have not been able to get it to work. The code involved is this:

  if (isset($file['timestamp'])) {
    $query_character = (variable_get('file_downloads', FILE_DOWNLOADS_PUBLIC) == FILE_DOWNLOADS_PRIVATE && variable_get('clean_url', '0') == '0') ? '&' : '?';
    $query_string = $query_character . $file['timestamp'];
  }

I tried creating a function to override the code in "template.php" (which was a copy of the "theme_imagefield_image" section in "imagefield.module", minus the above section), but it had no effect on removing the timestamp. I also tried renaming the newly-created function to "phptemplate_imagefield_image", as well as "[theme]_imagefield_image" (in this case, "[theme]" would be replaced with "garland"), but neither of those had any effect. The only way I could remove the query string from the image's URL was by removing that code from "imagefield.module". I'm not sure why it works when removed from "imagefield.module", but not when overrode in "template.php".

Could an option be provided to let the user determine whether or not to append this query string to the image's URL?

Other Information:

CCK Version

6.x-2.4

ImageField Version

6.x-3.1

Download Method

Public