Problems with 2nd display filling up screen

OK, so my friend bought a LE26R74BDX Samsung LCD tv and is over the moon with it. However his problem is as follows -

"I have one problem when linking it up as a PC monitor. I had a 15" Sony TFT as screen no.1 and then my sammy LCD as screen 2. Ive set the resoloution on screen 1 to 1024 by 768. And screen 2 is at 1360 by 768. The image comes up but it does not fill the whole of my the second screen. There is about 2 inches of grey either side"

However, if a window/application is maximised on this screen, it will fill up the screen - it's just the background that doesn't fill the screen. And before the wallpaper resolution idea comes, we tried widescreen wallpapers, and still had the problem.

Any ideas/software that could be used?

All gfx drivers are updated and all settings seem to be correct.

 

BUMP

C'mon guys!