WWW::Mechanize would probably be the best (as suggested), but if the site does insist on Javascript, Mozilla::Mechanize or Win32::IE::Mechanize might help (note: I have never used any of those two; WWW::Mechanize suits me well).

Update: ... and as for stripping the necessary data, please do have a look at Tatsuhiko's Web::Scraper. It might be a little tricky at first, but is a true gem which I learn to appreciate more and more everyday!