not displaying correctly in Safari (MAC)

Ok everything is GREAT with my portal, the only thing is on any macintosh, with the SAFARI browser, half of the right column of boxes gets displayed out of the main frame...

I don't have access to a mac so I can't really check it out, but in IE and firefox I don't have any problem... anyone know what the problem is? my portal instalation is located here: http://www.stunt.ca

THANKS