I could try that, thanks for the suggestions. The website is of the Dutch public transportation system, the part where you can view which trips you've made with your electronic travel card. It was designed completely from the viewpoint of the system, not that of the user. I.e.: Instead of seeing how much each trip costs, you see what got subtracted (a sort of deposit) when you checked in, and what you got back when you checked out. etc etc. Once I can publish the extension I'll write another post with the details...