For Linux user only!

I can't see icons in the menu.

If you use Gnome 2.28+ you have to enable the icons via the GConf-Tool. Open a shell and execute

gconftool-2 --type boolean --set /desktop/gnome/interface/menus_have_icons true

or use the gui program gconf-editor and navigate to Desktop -> Gnome -> Interface -> Menus have Icons and enable it.