How to connect 2 or 3 externadisplays to the macbook pro 15" (mid 2010, i7)

I have a new MacbookPro (mid 2010, i7) I have 2 HP monitors (20") and a big TV (50") I am setting up a classroom. I want to display 1 screen on the TV (which is behind me) mirroring a secondary screen I have in front of me, and also have another secondary screen in front of me.
So far I tried connecting only 1 HP monitor and the TV connected to an HDMI splitter (after the minidisplay to HDMI adaptor) using an HDMI splitter, and I only get the image on the HP monitor, the TV is black.
I have been reading about the USB to DVI boxes and they seem to work but not with the latest MacbookPro (i5 and i7).
Anyone knows how to achieve this setup in my computer (1 HP (DVI) mirrored on a TV (HDMI) and an extra HP monitor (DVI))?
Thanks

You will need to talk to the tech support people at Matrox about whether or not you could do what you hope to do with a TripleHead2Go DP Edition. I suspect you would be limited to an undesirably low resolution (1360 x 768 or lower) on all three external displays. I don't know of any other possibility for such a setup, other than running it off a desktop computer with multiple graphics cards.
http://www.matrox.com/graphics/en/support/gxm/

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How to connect 2 or 3 externadisplays to the macbook pro 15" (mid 2010, i7)

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