hi..

i want a small wireless camera with Tx and Rx
weight less than 10-20 gm (of cam)

to mount it on modelart quadcopter
im doing projct on video stabilization

Check this one out... it's about 19g.... Prateek13 has one of these!
http://www.hobbyking.com/hobbyking/store/__13987__Turnigy_30FPS_Ultra_Mini_DigiCam_without_memory_card_.html

hope it helps!

-aniket