Originally posted by: Citizen
Would be nice to have a realtime update when you enter in the source x,y numbers but I don't know if Javascript can do that and I don't know Java.

Yep, Javascript is capable of that, in fact the automatic updating of data is sort of the 'big thing' in the world of web design at the moment (most famous examples would be Gmail and Google Suggest). If you really do want to add that capability then just Google up AJAX as that is the name most people have started calling the now more popular method.