Menubar with bitmaps like msoffice menus?

Hi, i found that the menubar have this method:

setMenuItemBitmap (string menu, string menuItem, int bitmapIndex)

how i can use this method to put an image in the menu items like MSoffice, or this change all menuitem with an image?, how use it?

thanks.

ex:
// LaunchMenu
LaunchMenu.addMenu("Launch", 0);
LaunchMenu.addMenuItem("Launch", "Play Online", 0);
LaunchMenu.addMenuItem("Launch", "Host a Game", 1);
// Launch Menu Commands.
LaunchMenu.scriptCommand["Launch", 0] = "Canvas.pushDialog(JoinServerGui);";
LaunchMenu.scriptCommand["Launch", 1] = "Canvas.pushDialog(startMissionGui);";

function LaunchMenu::onMenuSelect(%this, %menuId, %menu){}

function LaunchMenu::onMenuItemSelect(%this, %menuId, %menu, %itemId, %item){}

etc....