It's hard to believe that that are no errors and that your browser window is just blank. I suppose this coul dhappen if your web server was misconfigured but here's another shot at an answer. I noticed the first line in your script

#!perl -w
[download]

This line is the path to perl on your system. My guess is that perl is located in /usr/bin/ or /usr/local/bin or something like that. You need to be sure that you know where perl is and fix that line to show the actual path. Then use warnings; You also need to loacte your webserver's error log and watch the messages that are being written to that file. If you are still having trouble after that, let us know and we'll try again.