submenus dropping off the bottom of the page

[thaistyle]

Hi,

could someone have a look at my test site :-
http://www.bluesarong.fsnet.co.uk/frontpage.htm

and advise me how to stop the submenus (at the lower
end of the mainmenu) from dropping out
of the base of the page.....obviously I would prefer
these submenus to pop upwards not downwards...

Thanks
Jim