Add 'var' before some global js vars

core/js/oc-dialogs.js

@@ -22,7 +22,7 @@
 /**
  * this class to ease the usage of jquery dialogs
  */
-OCdialogs = {
+var OCdialogs = {
 	/**
 	* displays alert dialog
 	* @param text content of dialog

core/js/oc-vcategories.js

@@ -1,4 +1,4 @@
-OCCategories={
+var OCCategories={
 	edit:function(){
 		if(OCCategories.app == undefined) {
 			OC.dialogs.alert('OCCategories.app is not set!');

settings/js/users.js

@@ -4,7 +4,7 @@
  * See the COPYING-README file.
  */
 
-UserList={
+var UserList={
 	useUndo:true,
 	
 	/**