No problem, do let me know if you decide to use it at all, I would be interested to see. I'm no javascript expert so my jquery examples with tooltips etc are pretty basic, I'm sure it could be used for more interesting things.
It would be possible but I'm not sure that would be that much more useful than just sending a separate request for each url. If there were lots of them, they could just be looped through. Also, with lots of urls, the response could start getting quite slow. Maybe I'm missing the point of what you meant?