Index: branches/5.2.x/core/admin_templates/categories/categories_edit.tpl
===================================================================
diff -u -N -r15614 -r15858
--- branches/5.2.x/core/admin_templates/categories/categories_edit.tpl	(.../categories_edit.tpl)	(revision 15614)
+++ branches/5.2.x/core/admin_templates/categories/categories_edit.tpl	(.../categories_edit.tpl)	(revision 15858)
@@ -296,12 +296,7 @@
 			function reflectDirectLink() {
 				$( get_control($field_mask, 'DirectLinkEnabled', undefined, '_cb') ).change(
 					function ($e) {
-						if ( $(this).attr('checked') ) {
-							$('#direct_link').show();
-						}
-						else {
-							$('#direct_link').hide();
-						}
+						$('#direct_link').toggle($(this).prop('checked'));
 					}
 				);
 			}
@@ -313,7 +308,7 @@
     Application.setHook(
     	'c:*',
     	function () {
-    		$(':input:disabled', '#' + $form_name).attr('disabled', '');
+    		$(':input:disabled', '#' + $form_name).prop('disabled', false);
     	}
     );