Using selenium to test servlet app

Hi guys
I'm having a hard time accessing a menu, created on a servlet. I can't seem to click on a menu element. I can click on the menu, let's say "File", but I cannot continue clicking on a submenu of "File", let's say "Open". The menu structure is div/table/tbody/tr/td. Every submenu has it's own tr and a few td's. I tried using selenium.click using xpath and id's without any luck.