So you will have to look at what you send, not what Netscape is sending - the popup is a response on what the server returns.

Not that this has anything to do with Perl.

Abigail

Just to make explicit what is implied in Abigail's message - there is no communication between the browser and the server when the browser pops up its window -- that is, no event that you can catch and script an action for.

Which is OK, since it will force you to fix the actual bug in your code, and not the symptom ;-)
If you post your CGI, we can try and figure out why it's not returning any output.

Since this only occurs intermittently, I am guessing that under certain input conditions, your program is producing an error message or simply not creating a body of the document.

You might consider adding code that you can use to learn what input has been supplied when the failure occurs. Then by checking your web server log for the time stamp of the failure, then look at your custom logged information for clues as to what sort of input causes your script to produce either no data, or the empty document.

If the problem occurs frequently enough that you can trap it in a relatively short period, you might want to consider running your script in such a way that it logs its output to a file as well as sending it to STDOUT (as the Unix tee(1) command might do)

Good luck

...All the world looks like -well- all the world, when your hammer is Perl.
---v

POST CODE!!!!!!!!!

Most likley you are not supplying the value of one of your variables.

This is where good debugging techniques come in handy. Litter your script with some print "Passed 1st loop\n"; type debugging messages and see how far the program gets.

ANYTHING that gets values from a command line script should check for value....

$foo = `dir C:\bar\`; 
unless ($foo ne "") {die("Could not get directory listing\n");}
@foobar = split '', $foo;
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Oh, yeah, post yer code!!!!

And do you have warnings and Strict turned on??

#! /usr/bin/perl -w
use Strict;
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Are you using CGI.pm?? What about

$co = new CGI;
print $co->header, $co->start_html(-title=>'Retail Ad Usage');
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~Hammy

Add this to the beginning of your script:

use CGI::Carp 'fatalsToBrowser';
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And, if you can, parse your Apache error log. (sorry, I assume you're using Apache - correct me if wrong :)

cLive ;-)