--- modules/upload/upload.module	2008-09-09 08:46:12.000000000 +0200
+++ modules/upload/upload.module	2008-09-09 08:47:42.000000000 +0200
@@ -801,7 +801,7 @@ function _upload_form($node) {
       '#suffix' => '</div>',
     );
     $form['new']['upload'] = array('#type' => 'file', '#title' => t('Attach new file'), '#size' => 40);
-    $form['new']['attach'] = array('#type' => 'button', '#value' => t('Attach'), '#name' => 'attach', '#id' => 'attach-button');
+    $form['new']['attach'] = array('#type' => 'button', '#value' => t('Attach'), '#name' => 'attach', '#attributes' => array('id' => 'attach-button'));
     // The class triggers the js upload behaviour.
     $form['attach-url'] = array('#type' => 'hidden', '#value' => url('upload/js', NULL, NULL, TRUE), '#attributes' => array('class' => 'upload'));
   }