If the web page in question relies heavily on JavaScript, then you can't directly use Mechanize as it doesn't include a JavaScript engine - see
WWW::Mechanize::FAQ. There are a couple of alternatives available. You might be able to use
Win32::IE::Mechanize or
Mozilla::Mechanize, which are supposed to offer external control over your browser. I've never used either, though it seems
Win32::IE::Mechanize is better developed and tested. A more roll-you-own solution would use
JavaScript::SpiderMonkey, but that's getting pretty hairy. Another choice is if figuring out how the page processes your userid and password and just crafting your own query string - I'd probably take this approach.
Determining success should be as simple as examining the content of the new page.
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