Can't get past the Javascript

Hi
Trying to scrape these pages, but just come up against a JS script that I can't get past?
http://www.butterfieldplant.com/stock.php

It is not calling another file with json data, it is an old site That uses this script for a navbar and rollover functions or something odd?

The page works fine when I take it from the proxy. I am sure there is something simple that I have missed?

I just need to get past it to access the html.

I assume it is a cookie thing - never really had to work with them before.

Thanks for your help in advance
Jason