CRE/OSC Install 'Lightbox' Image Popup & Homepage Bug Fix

Basic info about our website: Live site: [login to view URL] OSCommerce is CreLoaded v6.2b2b This is a standard configuration but has had some small mods added relating to multiple products management. We would like Lightbox2 added for our image pop-ups. I think the details are here: [login to view URL] Also there is a bug on the homepage of our website. When you first visit our website (tested in IE8), and you click on one of the information pages from the left navigation, e.g. Jobs, it shows an empty page with an list of our information pages: 'About Us Delivery Jobs Privacy Terms and Conditions Warranty & Returns..... etc' instead of showing the jobs page which should have appeared. if I then click 'jobs' again it goes to the correct jobs page, and every next time it is clicked from then onwards, it works correctly, so there seems to be a bug that we would like to be found and fixed. (Cache related?)