DumbQuestion::ApacheAndPerl

Dear all, whenever a Perl script needs to be executed on the Apache server, its source code is shown on screen. Example: if I point my browser to our intranet like: http://intranet/scripts/test.pl I get "!#/usr/bin/perl ..." (without the quotes) and not what it's supposed to do (actually, show the intranet contents as Windowze-like folders). What do I have to look for in order to get things working? Thanks, Martin