Drivers side rear Window Please help!!

Hey everybody, can some one give me any idea as to what i should do. I have a 2001 e320 my rear driver side window started making noises when i was rolling it down, like a cracking sound. now it will not go up by it self and if i pull it up it wont stay up as i'm driving, it goes half way down. i'm not sure if it's the regulator or not. Any ideas whould be greatly appreciated!!

Broken regulator....Diy on benzworld.org w210 section diy area at the top of the page
part at www.autohausaz.com
ohlord
read the diy get a rivet gun follow the instructions

Thanks...I'm going to get the part and try it. The DIY is perfect!

Video for rear door panel removal.
http://w210.pietrzyk.net/disassembly_reardoor.htm
ohlord

Nice!! this is very helpful!!