You can't turn off the case sensitivity. It's part of Unix, so you're stuck with it, I'm afraid.
If this situation has been created by the users uploading these documents, then they've created their own problem. The HTTP spec also specifies case sensitivity. If the users have decided to ignore this and generate their documents on an OS that appears to be case-sensitive, but isn't (go on, take 3 guesses as to which one I'm talking about...), and then they find that their case-sensitive links don't work, then that's their fault...
(I spent a few hours this weekend helping a friend to fix his website when he found it didn't work after he uploaded his documents to the server. The problem? His HTML editor had inserted all document links in mixed case, but the documents he had been linking to were in a mixture of lower case, upper case, and "sentence case". A couple of hours using vi and perl soon sorted that out.)
I believe that there is a module for the Apache web server that will deal with this. It removes case-sensitivity from all HTTP requests and serves documents in the same way. However, I don't think that you can do this using iPlanet. [sig]<p> Andy Bold<br><a href=mailto: > </a><br><a href= > </a><br>"I've probably made most of the mistakes already, so hopefully you won't have to..." Me, most days.[/sig]