Thanks Jason for the suggestions. Powerstore isn't an option as the website has already been built (I've used my previous Dinky Fingerprint website for the core code). Plus once I get this organise in my head it's just a case of implimenting it into my website.
I think (with the help of Dave's code on the select list from his website - thanks for the link Dave) I believe his technique would be spot on in being able to navigate the select lists :)