Index: /CKEditor/branches/prototype/_source/plugins/button/plugin.js
===================================================================
--- /CKEditor/branches/prototype/_source/plugins/button/plugin.js	(revision 2390)
+++ /CKEditor/branches/prototype/_source/plugins/button/plugin.js	(revision 2391)
@@ -111,5 +111,5 @@
 	render : function( editor, output )
 	{
-		var env = CKEDITOR.env.opera;
+		var env = CKEDITOR.env;
 
 		var id = 'cke_' + CKEDITOR.tools.getNextNumber();