Hej Corion and thanks for your reply.

I wrote "CGI.pm documentation says that I can use onClick argument with JavaScript, but I don't know nothing about JavaScript, so any help/pointing to right place is appreciated, just please don't expect from me to learn JavaScript just for this purpose." which means I did read CGI.pm documentation (I'm not claiming that I understood everything though), and I really don't have a time to learn JavaScript just for this one.

I was thinking that it has to be already done like a million times, but I couldn't find anything that works on the web. Or I just don't know how to implement it.

So if there's any chance to get some help here then fine. If not then it's fine too.