And if you feel uncomfortable with Ethereal/Wireshark, you can use Mozilla extensions such as LiveHTTPHeaders or Firebug. Or just figure out what the JavaScript is doing manually. (Given how common these questions here are, someone really ought to write a "How to deal with JavaScript" document.)

"I am also writing a program that trades shares,everything is going fine only i have no idea how to process the orders with the web: making the program wait for confirmation of the order, logging in broker, making the program do what i would do if i bought via web broker. What would books would help me in my cause?"

I don't understand Dutch but you should check to ensure that this does not violate the terms and conditions of the website. I notice they provide other products/services for trading. Perhaps they have an API which you can use which would actually solve some of these problems for you.

You can use WWW::Mechanize::Firefox (as its engine do run javascript; your program will depend on the browser) or read javascript manually and write some Perl logic which does the same by parsing values from the page source.

You can also try WWW::Scripter (and WWW::Scripter::Plugin::JavaScript) or WWW::Mechanize::Plugin::Ajax.

Myself, I prefer reading JS manually and writing same logic in Perl. It leaves my scripts simple whan I'm working with small and simple sites.

Thank you all so much for the help, I have an applescript that logged in on the site, but I have no idea how to do that in perl

do shell script "open -a safari 'https://login.binck.nl/klanten/Login.
+aspx?ReturnUrl=%2fklanten%2fdefault.aspx'"
tell application "Safari"
    activate
    tell document 1
        repeat until ((do JavaScript "location.host") is "login.binck.
+nl")
            delay 1
        end repeat
        do JavaScript "document.getElementById('ctl00_Content_Gebruike
+rsnaam').value='username';document.ge tElementById('ctl00_Content_Wac
+htwoord').value='password';window.open(document.g etElementById('ctl0
+0_Content_LoginButton').href, '_self', 'true');"
    end tell
end tell
[download]

After reading WWW::Mechanize::Cookbook, I can suggest the following:

1. Install WWW::Mechanize::Firefox
2. Install the MozRepl plugin in your Firefox

3. use WWW::Mechanize::Firefox;
   my $mech = WWW::Mechanize::Firefox->new(
       launch => '/path/to/firefox',
   );
   $mech->get('https://login.binck.nl/klanten/Login.aspx?ReturnUrl=%2fkla
   +nten%2fdefault.aspx');
   
   $mech->eval(q{document.getElementById('ctl00_Content_Gebruikersnaam').
   +value='username';document.getElementById('ctl00_Content_Wachtwoord').
   +value='password';
   window.open(document.getElementById('ctl00_Content_LoginButton').href,
   + '_self', 'true');});
   [download]

This is just an untested rewrite of your AppleScript in Perl. It's possible that even Firefox is not needed (and only WWW::Mechanize is required), but I was not able to find the form ID on the login page because the page doesn't work for me.

Sorry if my advice was wrong.