Nav not working wen rollover button inserted

Hey guys,

Im having problems with the site im building. The navigation is not working when i insert a rollover button (apart from the main nav, on the same page) why is this happening? the pages without a separate rollover work perfect! I have tried reinserting the nav and rollovers, but still either way, the single rollover is never inactive. Only the main nav disables?

please help!