CSS powered drop down menu implementation issue

I'm very new to CSS and my javascript knowledge wouldn't be great so when I was asked to change the menu of the company website to a nice drop down system I knew I would struggle
I eventually found 1 that was easy to customise- PVII CSS Express Menu and Im happy with how it looks/works now and it seems to work all the way back to IE 5 which is a bonus:

www.koremeltdown.com/dropdown


My problems started when I tried to replace the original menu system of the link below (removed company name-sorry for the mess and Im sure its still in there somewhere anyway)

www.koremeltdown.com/sample

It kinda went completely haywire and I just dont know what to do
Anyone have any pointers/know how it should be done?
Id really appreciate any help on this one, boss is on my case and it would be great to get it working

I'm sorry I don't understand the question. What went haywire?
I've looked at the site in FF2 and IE 7 and don't see a problem.

Sorry,

I only posted the 2 parts I wanted to put together cause when I tried it went bananas-

www.koremeltdown.com/sample2

Link might make it clearer whats going on

I see you are having problems with the navigation.

Not trying to pass the buck here but since you got the navigation at PVII, why don't you post the question on their forums. They have great support. They'll probably know in a heart beat what the problem is.

I do not.

Thanks, didn't realise they had a forum