The easiest solution is to interface with the site through some documented API that bypasses the Javascript. But this would mean that you've got explicit permission to be doing what you are doing. If nothing of the sort exists, it's possible that the bank has no intention of allowing such activity.

In any case, you ought to secure that written permission before you proceed much further. Without explicit permission, in writing, you're probably running afoul of the bank's website's Terms of Service. I think that scraping a bank's website is at minimum going to earn you a cease and desist letter, or worse.

Question: Why would that warrant a cease && desist?

If you're using the site properly, then you probably will be okay, in fact if all you're doing is filling out a form, then they will more-than-likely never know. If you're going to try and spam through, cause DoS, or hack-and-slash your way in, then you'll probably be in trouble.





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Demize

You can use Win32::IEAutomation or WWW::Mechanize::Firefox or Win32::IE::Mechanize or you can find what's happening on the site (by investigating Firefox HttpFox and Firebug for example) and after that emulate this behavior in WWW::Mechanize.