Body Size Simulation?

how do you make the before and after? i made the current one, but now what?

I found this one: http://makeovr.com/weightmirror/liftupload.php

It didn't go up to as many pounds as I need to loose (went to 73; I need to lose 100), but it was kind of cool.

http://photos4.mfpassets.com/images/photos/653/957/6653957_8546.jpg

Don't know if this will work but I went to mvm.com and made this avatar that is my size.
I guess I don't know how to do it but you can go to my pics and see it.