Image submit buttons on Drupal 5.10

I follow this useful howto by Tom Constant on how to add image submit buttons on Drupal forms. Since I got a JavaScript error on drupal.js (line 31: button is undefined), I rewrite Tom’s implementation, and now it works fine on Drupal 10:

=> this useful howto by Tom Constant

function phptemplate_button($element) { // Make sure not to overwrite classes. if (isset($element['#attributes']['class'])) { $element['#attributes']['class'] = 'form-'. $element['#button_type'] .' '. $element['#attributes']['class']; } else { $element['#attributes']['class'] = 'form-'. $element['#button_type']; } // here the novelty begins: check if #button_type is normal submit // button or image button switch($element['#button_type']) { case 'image': $button_type = 'image'; break; default: $button_type = 'submit'; break; } return '

=> https://web.archive.org/web/20080910000000*/http://www.tomconstant.com/2008/01/09/adding-image-submit-buttons-in-drupal-5/