Solving a Snow Leopard 64 Bit Problem - Will this work?

Here's the problem. After upgrading to Snow Leopard a program I need for my job no longer works. The program is Webex. They claim that it should work by opening Safari in 32 bit mode or with Firefox, but neither option works for me.

My plan is to reinstall Leopard (10.5) on an extra partition and reboot into it whenever I need to start a Webex session. I don't think this will cause any problem with my Snow Leopard partition, but thought I would check first.

Thanks in advance
Mark


Mac Pro early 2009 quad core
12GB ram
4 internal drives