File uploading

Hi. I'm using Linux 6.2 server, apache + php3 + mysql. I've just finished writing a web based file management system for an intranet, whereby clients upload/delete files to the server from a web page, and the php inputs the file info into a database (mysql), and automatically creates/deletes directories on the server, where it will then upload the file. Everything works great so far except for one serious problem: I'm using the "copy" command, which copies(uploads) from the client to a /tmp first, and then copies from there to the appropriate directory. The problem is that, apparently, there is a 2 Mb file size limitation for doing this. Does anyone out there have a way around this ? Clients very often upload excel, power point, and other files that greatly exceed the 2 Mb limit. Any help is greatly appreciated. Thanx in advance. Tim E Patterson