Hi Guys

I was hoping to have some help setting something up. I am using a 17" MBP late 2011 with an ATI 6770m. I am connecting to an Apple Thunderbolt Display with my only thunderbolt port, I would also like to mirror my display through an HDMI port on my projector at the same time. Is this a possibility or am I out of luck. I have a mini display port to hdmi cable but this will not work from the thunderbolt display to the HDMI port, it will work from the thunderbolt port on the MBP.

Help would be great.