Of course you will have to run your webpages within a real webserver or else it will not work. You Perl script is now more or less hanging in the air (hence you see it running in a "dos"-window, but the output is not going to your browser) and this has nothing to do with HTML-formatting.

So you will have to set up a real webserver (not the HTML renderer which Frontpage uses to show your HTML-page).

The easiest way to set up your own webserver is to install a free Apache webserver, which you can find here (all configured so it runs straight out of the box).