Three Screen Display...?

I have an HD Radeon 4670 with two DVI slots and one S-Video. i have a 22" monitor plugged into each of the DVI's and a 19" tv on the S-Video. I can get any combination of two screens to work but i absolutely cannot get all three to work at the same time. Is this setup actually possible?

Not possible. That vid card only supports up to two video displays. The S-Vid linked to one of the DVI ports (not technically linked, but that simplest answer)