It means that libXss.so.1, libaspell.so.15, and libgtkspell.so.0 have to be installed before gaim can be installed. I would go to
http://rpm.pbone.net/ (bookmark that page, you'll be back there again) and search for each one by name for your distribution. Just type in "libXss.so.1" and search, it will find an rpm that contains that file. Then do the others. However, I'm not very familiar with redhat, but I think it should have something like "yum" It's a program that will get programs for you and solve the dependencies itself. If you can do it that way, you'll save loads of time and headache. Google "yum and red hat 9.0" and I'm sure you'll find something. Good Luck!