Trying to run 2 external monitors, can't turn off clone mode

I have the 13" macbook pro running snow leopard, and recently bought two acer VGA monitors with a Matrox DualHead2Go. My problem: each monitor shows the same exact thing no matter what i do. I understand this is called "clone mode," and i can't seem to turn it off. I downloaded the driver for the matrox, and have tried a million different things to get clone mode to turn off. It seems like my computer only recognizes one monitor. When i try to arrange the displays under the preferences, it only shows only one external display. I have scoured the internet--no one else seems to have this exact problem. My guess is something's wrong with the dualhead2go, or maybe the one i have isn't the right one, or isn't for mac. Help please!
thanks,
hcm

If it's not too late to look at other products, you may want to check out Tritton's USB for multiple monitors. Before I switched from a PC, I had used Matrox Dual Head2Go with hit and miss luck. I then switched over to Tritton's product - it was a lot cheaper and worked better for me. When I switched to my MacBook Pro, I was able to continue to use the Tritton USB. I am currently running two monitors (VGA), plus my MacBook montor, for a total of three monitors. For my two VGA monitors, I am using a DVI to VGA plug, and the Tritton USB. It's been working great for me, and no problems with using extended desktop (as opposed to clone).
Good luck, and let me know if you have any folow-up questions.

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Trying to run 2 external monitors, can't turn off clone mode

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