KATIE!!!! That seems to have fixed it. It was the graphics card. I turned virtual memory on and had some 7000M on the hdrive.That didn't work so I downloaded a driver update for the Radeon 7000 Mac Version and installed that. So far no crashes, 20 minutes and counting. Incidently if anyone else is having this problem with this equipment, the 2002 retail update from ATI was corrupt or something and wouldn't install. The 7000 series worked. I have sent a note to ATI.
Thanks!