As usual, track with Wireshark the difference between what your Perl script sends and what your browser sends when you access the page with it.
Also, consider just automating the page using WWW::Scripter or WWW::Mechanize::Firefox, both of which know how to handle Javascript.
In reply to Re^5: scraping ASP page, __VIEWSTATE problem
by Corion
in thread scraping ASP page, __VIEWSTATE problem
by Anonymous Monk
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