Patapata
http://www.csse.monash.edu.au/~jwb/c...A4%D1%A4%BF_vs
if that doesn't work:
http://tinyurl.com/33xfdq
"ぱたぱた (adv,vs) (1) flap (sound of something light and thing such as a fan moving through the air); (2) pitter-patter (sound of light footsteps); (3) dealing with a situation quickly"