[yorkshiresource]

I use a modified version of a small js script called mootabs for this type of thing - it will work by either requesting the new content via ajax or modifying the dom. The benefit of the latter is that the whole page content is present in the source on page load (obviously better for your seo)

Apparently I can't post links so you'll have to google mootabs.

It uses the mootools library which provides really powerful tools for acessing and modifying the dom with js and css selectors - I use it all the time.