Index: form.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/form.inc,v
retrieving revision 1.266
diff -u -r1.266 form.inc
--- form.inc	6 Feb 2008 19:38:26 -0000	1.266
+++ form.inc	7 Feb 2008 19:55:31 -0000
@@ -1749,7 +1749,7 @@
       case 'submit':
       case 'button':
       case 'image_button':
-        $element['#ahah']['event'] = 'click';
+        $element['#ahah']['event'] = 'mousedown';
         break;
       case 'password':
       case 'textfield':