Solving Thevenin Equivalent with 1 Point & Ground

[Mugged]

Hey I can't figure out how to convert the below circuit into its thevenin equivalent. I am used to having two points to work with, but in this circuit there is only one and a ground.

http://img715.yfrog.com/i/13332492.jpg/
for some reason the image doesn't show up on my screen; if that's the case for you, the link is below
http://img715.yfrog.com/i/13332492.jpg/

help appreciated!

 

[ehild]

Find the Thevenin equivalent between the free end of R3 and the ground.

ehild

 

[Mugged]

im still confused about the +5 V end, can you actually show me?

 

[ehild]

There is a voltage source connected there. I made a new drawing, find the Thevenin equivalent between A and B.

ehild