Problem with simple javascript dom function!

Hello all,

I'm working on this site - http://dev-duo2.kozmo.co.uk/

If you click on a submenu option, for example 'Background' that appears 
under the "about us" menu, then it is then showed by a change of class 
(class="sub-menu show"). When the user rolls over another menu item, for 
example Our Services, the About Us submenu is still showing. I am trying 
to hide this submenu on the user rolling over a different menu item.

I'm getting a bit stuck already though! In Firefox, I get an error of

Error: mainMenuItems has no properties
Source File: http://dev-duo2.kozmo.co.uk/library/js/menu.js
Line: 16

when any page loads.. the html validates and the "main-menu" id exists. 
Does anyone have an idea why it might be generating that error?

Many thanks in advance,

Alastair


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