diff -Naur mate-menu-editor-1.2.0-old//Mozo/MainWindow.py mate-menu-editor-1.2.0/Mozo/MainWindow.py
--- mate-menu-editor-1.2.0-old//Mozo/MainWindow.py	2012-03-14 15:37:59.000000000 +0200
+++ mate-menu-editor-1.2.0/Mozo/MainWindow.py	2012-05-14 20:24:52.469138272 +0300
@@ -599,7 +599,7 @@
 		self.editor.redo()
 
 	def on_help_button_clicked(self, *args):
-		gtk.show_uri(gtk.gdk.screen_get_default(), "ghelp:user-guide#menu-editor", gtk.get_current_event_time())
+		gtk.show_uri(gtk.gdk.screen_get_default(), "http://mate-desktop.org/", gtk.get_current_event_time())
 
 	def on_revert_button_clicked(self, button):
 		dialog = self.tree.get_object('revertdialog')