We support the scripts on the server side. So if someone is having a script problem, we do take a look at it to make sure that there's no reason it shouldn't work on the server.
After that, any programming, configuring or coding is up to them. If it's a small CGI script and we know what the answer is right away, of course we'll tell them and/or help them out... and we often make suggestions.
But it's a part of our FAQ that we don't support client's scripts, applets, etc or any other content. Well, we will for $50.00/hour.
Oh and I totally agree with the statement that the least profitable customers are the most problemsome. They seem to expect everything for nothing. sigh....
I also agree with Kunal. If it's nothing obvious to us and it's not a problem on the server, we often tell them they will need to contact whoever the script creator is.