Thank you for your quick response.
I have added the menu (menus addon with wordpress 3.0.1) to the site with no problem as you say.
my current style.css is
[Mod Note: Code segment removed. If you want to post large blocks of code, please use a pastebin (Alternate URL). Thanks!]
Can I ask if you could hold my hand and point out where I need to add these changes ?
Many Thanks