You can create a custom menu on the top of your page instead of using the left hand menu.
This will only work if the "Site Shortcuts" app is either on top or beneath of an Image App, or a Flex Editor App and placed on the top section of the layout. Also your left navigation should also be disabled.
Click on the two examples we have for Top menu:
Menu on top of your banner/image click
here.
Menu beneath your banner/image click
here.