How can I operate  multi displays on my Imac 21.5 quad core 2.5 and have each display function independently?

how can I operate  multi displays on my Imac 21.5 quad core 2.5 using Lion and have each display function independently?

Below are some converters/adapters to look at.  If these look like they may work:
USB 2.0 to HDMI Audio Video 1080P Adapter for Windows and Macbook
Matrox DualHead2Go D2G-A2D-IF (or look here)
These should allow you to run multiple displays in extended display mode.  Note that these use HDMI as an output so you would need some additional adapter to conver HDMI to whatever your displays require.  Of course these suggestions are all academic if such an adapter doesn't exist.
Update:
I just reread your last post and I am confused.  Is it only your TV that you are trying to run in extended display mode?  I thought you wanted more than two displays.  If only  the TV it should just work if you are not using mirrored displays.  Your Displays Arrangement tab should show both your main screen (one with the little whith menu bar) and the TV.  Set the proper resolution and refresh rate for the TV using it's Displays preference window.  That is all you need to basically do (ignoring overscan/underscan problems).
Note, if you are using Lion then I have heard that when using full screen mode in Lion additional screens show nothing.

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