is there a script or a way to have ragdoll phisics plz tell me
Well not really, but Appolonius who’s on irc #gameblender channel a lot, made a ragdoll test with the Ode engine (another blender game engine) and it worked well, but needs a lot tweaking.
For the current engine there’s no ragdoll function, if you are able to script c++ and some python you can script it by your own, or just ask the coders on http://www.blender.org on the forum to make this feature availible. 
ehuh thanks jd i know c++ can u use that in blender ???
thx
the gameblender source is written in c++
(rest of blender iirc is c)
oh wicked cool thx