Hope you can help! I'm OK with the Flash & the PHP but JavaScript is something I have had to muddle my way through. Any suggestions would be appreciated

I am just finishing a site for a photographer which uses Flash for the interface, PHP to display a number of image thumbnails (4 scripts, depending on the route the visitor has chosen) and then 1 PHP page with lots of JavaScript to open the correct image in a new popup window.

It all works in the latest versions of NN & IE but the problem is that some of the site owners' clients use older browsers and the JavaScript popups are not working in NN 4.7.

The address of the developing site is here.

The JavaScript that I am using is an adaptation of Anarchos' great script.

Are there fundamental things I am missing regarding NN 4.7 and JavaScript or would my scripting in JavaScript be wrong?

Thanks in advance