hi JM123 i use DisplayFusion: Multi-Monitor Taskbar and Desktop Wallpaper|Binary Fortress Software
i have 2 monitors and a 50" plasma
the 2 monitors are different res and its not a problem
with my ati card i set up a short cut profile for a main monitor and tv setup 1 click and its done.
if they are mirrored im not sure but still worth a look m8