You might also want to check out WWW::Mechanize::Firefox if you are new to browser automation. This module will actually open up a new browser for you and you can watch it navigate and fill out forms. You don't have to worry about reverse engineering forms with javascript to figure out what they are doing. I know for me that it made browser automation a little easier to figure out because you can actually watch your code in action and see what you did wrong.

The downside, of course, is that you can't run this on a machine without a copy of Firefox.

To get it working, you need to download the mozrepl add-on. Once installed, you need to turn mozrepl on before it will work with WWW::Mechanize::Firefox by going to "Tools" -> "mozrepl" -> "start". By default, mozrepl listens on port 4242 but you can change that under "Tools" -> "mozrepl" -> "change port". I also always do "Tools" -> "Activate on startup". That way my code can fire up it's own copy of FF and start using it all by itself.