Menu display problem in Opera

[fredlongworthhighschool]

Afer finally getting frames to work, i've noticed that the menu isn't showing corretly in Opera.

You can see the problem here:

http://www.flhs.wigan.sch.uk/!new/

I've tried changing a few figures in the JS files but I don't know as to whether it's a frames sizing problem in my HTML or in my JS.

Thanks.