Milonic JavaScript Menu

I want my navi bar to be aligned to the center of the page regardless of the resolution of the com that is used to view the page but where do i put this:

with(milonic=new menuname("mainmenu")){
screenposition="center"
top="offset=-200

i'm still using the old version coz I'm lazy to change it.
It ...

Thanks for all the help!

what i mean is, my menu is already in the correct position but there is no way i can place my other stuff (like text and images) under the menu. They are always behind the menu.

The menu overlaps with my text i.e. my text is hiding behind the menu. What must I do to let my text be below the menu?