Glitchy table elongation in firefox. bummer

i just finished making my first website,, in dreamweaver, and it works perfectly in safari. however, i just showed it to someone who uses firefox and he pointed out that the images that comprise the left menu elongate horribly when on any page but the first one, and the “about” button sometimes disappears completely.

anyone understand what the problem is? i’m very new to this, and i’m stumped