I'm going to pretend someone here helped me instead of me finding the info on dpreview.com's forums.
http://forums.dpreview.com/forums/re...ssage=17124908
"I have had good luck with using the internal flash and also the SB-600 to trip my 3 strobes.
Set the WB to Flash on the camera. Set the on board flash to manual or the SB-600 to Manual which ever you are using then set the power to the minimum setting - with the power set to the minimum, it will trigger the strobes but will not add to your photo.
when I do this, the camera is set to full manual and sometimes to Aperture control.
I also sometimes use a wein safe synch and a pc cable to trip a strobe and the others fire along with it when they see the flash. Either way will work but the key is to have the flash on your camera set to manual to prevent the pre flashes.
Hope this works for you as well. "