Picture overlap on external display imac 24

Hello everyone,
I have my Samsung TV connected to my iMac 24" (early 2008) so I can watch movies etc...
When maximising a window on the TV it cause parts of the window to overlap the screen. So the close, minimise and maximise bar is hidden and cannot be viewed.
Can someone point in the direction as to how I can calibrate the display to fill the screen rather than overlap?
Thanks!

Never mind. It was a TV issue, I had it set to 16:9! Changed it to 'scan' and works perfectly.
Here's a link if anyone else has the same problem: http://www.katescomment.com/tv-monitor-how-to-fix-overscan-zoom/

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