Inverse kintetics is how the Ragdoll demo in Flash was created. Using the Verlent Integral which is common in many advanced games like Hitman but works for any physics based program.....even in Flash. If you dont understand the math in the tutorial I posted, you will have a very difficult time recreating the demo. If you search the net, you can probably find a demo source .fla file to look over and modify, but if you want to learn to create something like this from scratch, you will need to fully understand the math that is in the link I posted. Here is a quick google search link that might lead to a source file if you dig through some of the links....
A mind once stretched by a new idea never regains its original dimensions.
- Oliver Wendell Holmes