You write a script that POSTs information to the site, and that parses the HTML returned, of course.

Look into LWP::UserAgent and the various HTML parsing modules- my personal favorite is HTML::TokeParser.

No one is going to write it for you for free here. I suggest you look at lwpcook, on your local perl 5.6.1 system, or here. lwpcook is an excellent overview of how to accomplish specific things with various LWP modules.

crazyinsomniac has a great HTML::TokeParser tutorial here.

-Any sufficiently advanced technology is
indistinguishable from doubletalk.