Dual monitors and TV-out

Hi,

I have just bought a new monitor and want to use my old one as a second monitor. This was no problem and I strech out the desk unto this sec monitor. The problem arise when I want to use my tv-out to see a movie etc on the TV. I can't find a way to clone the TV as I used to as I have the other monitor as stretch. How can I set this up to be able to use my monitors and the TV at the same time? I have a HighTech X800 Pro (Ati) which have one DVI, one VGA and one TV-out. The new monitor is set to the DVI, the old one to the VGA and the TV is of course connected to the TV-out.

On the Control Panel -> Display -> Properties I only see my two computer monitors, not the tv. But when I go to Control Panel -> Display -> Properties -> Advanced - Displays I have all three monitors to choose from. But I can't clone on the tv at the same time I have extended desktop for the two other monitors.

Ideas of settings or program I can use to accomplish this?
Thanks in advance.