Connect macbookpro 10.8.2 to iMac 10.6.8 | Thunderbolt to Mini Display

Sorry if this is redundant but i've had no luck filtering through discussions to find my specific scenario. I have a macbook pro running 10.8.2 with thunderbolt and am trying to connect it to my iMac running 10.6.8 with mini display. I'm looking to use the iMac as a monitor. I have a VGA cord and have connected a thunderbolt to VGA adapter into my macbook and on the other end have connected a mini display to VGA into the iMac. When I connect the two the iMac's screen resolution slims up and blows up the pixel ratio while the macbook just blinks a blue screen off and on. When hitting the f2 key on the iMac, nothing happens.
I'm pretty frustrated right now and can't seem to find a clear answer to problem. Are the two simply incompatible, does the iMac's OS need to be updated to Lion? Any insight on this would be very appreciated.

Hey jackedInOakland,
Thanks for using Apple Support Communities.
Looks like you want to use the iMac as a 2nd display. This article will help you get this setup.
Target Display Mode: Frequently Asked Questions (FAQ)
http://support.apple.com/kb/HT3924#4
What are the requirements for TDM?
A Mac notebook or desktop with a Mini DisplayPort or ThunderBolt connection
A ThunderBolt or Mini DisplayPort cable 
A supported iMac with OS X 10.6.1 or later. The table below shows iMac computers that support TDM, the required cables, and the port of the computer to which you are connecting the iMac.
iMac Model
Cable Supported
Port on Source Computer
iMac (27-inch Late 2009)
Mini DisplayPort to Mini DisplayPort
Mini DisplayPort or Thunderbolt
iMac (27-inch Mid 2010)
Mini DisplayPort to Mini DisplayPort
Mini DisplayPort or Thunderbolt
iMac (21.5-inch, Mid 2011)
Thunderbolt to Thunderbolt
Thunderbolt
iMac (27-inch, Mid 2011)
Thunderbolt to Thunderbolt
Thunderbolt
iMac (21.5-inch, Late 2012)
Thunderbolt to Thunderbolt
Thunderbolt
iMac (27-inch, Late 2012)
Thunderbolt to Thunderbolt
Thunderbolt
Have a nice day,
Mario

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