LG VX-8600 / AX-8600

While navigating through screens I can never figure out how to go back to the last screen without hitting end or even flipping the phone shut. Sometimes in Get it Now I can go to the home page, but thats a pain. Even browsing through ringtones and pictures is a pain because I always have to go to the main menu and start over instead of going back to the last screen. Is there a shortcut similair to a "back" button? Thanks