Prevent loading core files multiple times. Fixes #4130 - Too much recurson with double include.

Author: scottgonzalez

ui/effects.core.js

@@ -7,11 +7,9 @@
  *
  * http://docs.jquery.com/UI/Effects/
  */
-;(function($) {
+;jQuery.effects || (function($) {
 
-$.effects = $.effects || {}; //Add the 'effects' scope
-
-$.extend($.effects, {
+$.effects = {
 	version: "@VERSION",
 
 	// Saves a set of properties in a data storage
@@ -130,7 +128,7 @@ $.extend($.effects, {
 
 		});
 	}
-});
+};
 
 
 function _normalizeArguments(a, m) {

ui/ui.core.js

@@ -7,7 +7,7 @@
  *
  * http://docs.jquery.com/UI
  */
-;(function($) {
+;jQuery.ui || (function($) {
 
 var _remove = $.fn.remove,
 	isFF2 = $.browser.mozilla && (parseFloat($.browser.version) < 1.9);