You're assuming Mechanize handles javascript, it does not ( WWW::Mechanize::FAQ).

See ?node_id=3989;HIT=mechanize%20javascript;re=N, http://livehttpheaders.mozdev.org/, WWW::Mechanize::FireFox

In reply to Re: Difficulties with WWW::Mechanize ->click_button() difficulties by Anonymous Monk
in thread Difficulties with WWW::Mechanize ->click_button() difficulties by jdetloff

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