Please list your Oscommerce experience here.
lightbox/[url removed, login to view]
We have tested on with multiple product pages with identical results every time.
You may wish to disable lightbox and re-test your website to see if that resolves the issue. Otherwise you should contact the script author or support forums for assistance. We noted that this script appears to be about 10 years old (per the copyright notice) -- perhaps there is an updated version that does not have this issue, but keep in mind that your server is running php 5.2 and newer software may not be compatible.