Drop down display issue

i think i found a way of making my menus using entirely CSS (no java support) from this link: [COLOR=#800080]http://www.wrightthisway.com/Articles/000022.html[/COLOR]

but i wanna display my drop down menus in one single line, because at the moment it is always splited into 2 lines and if i add 3 links more, the menus are splited into 3 lines and so on,

also, it would be good if i center them in one single line,

i have attached the sample of what i did

any help would be appreciated

thank you