Want to use 2010 iMac as dual monitor for 2011 iMac

[gohome190]

Easy as pie, right? Just utilizing Target Display Mode, right?
http://support.apple.com/kb/HT3924?viewlocale=en_US&locale=en_US#4

However, The 2011 iMac only has thunderbolt ports. The 2010 iMac only has mini-displayport ports. Is there any way to make this happen?? Like thunderbolt -> mini displayport? or vice versa?

Thanks!