in reply to Mimicing browser with LWP

You could make your life a bit simpler than constructing the post data yourself, using HTTP::Request::Common:
return POST("http://www.BrilliantPeople.com/jobsearch.asp", [ undef, # Search for Information Technologies stuff. hdnOccupationSelectionCodes => join(",",5118..5137), txtKeywords => 'programmer', # numberperpage => 100, # currentpage => $page, ]);
But that's just a sidenote. What I wanted to ask is did they change their site in the space of half a day? I can't find any form with a "hdnOccupationSelectionCodes" parameter there.

Makeshifts last the longest.