Transmission fluid leak!!!

[ptguy69]

Hi everyone, I noticed this leak last weekend when i changed my oil. It is coming from the back of the transaxle. At first i though it was just residual gunk so i wiped it off. I checked it again today and its leaking from between a gasket and the tranny. My transmission has also started "bump" shifting from 4th gear into 3rd when I slow down. It started on sunday night after I was getting off the freeway from Orange County. (Thats about a 70 mile round trip for me.) And it hasn't stopped. It is also hesitating in 3rd gear. Almost as if it doesn't want to shift into 4th, but after about 4 seconds it does. What should I do?
P.S. A picture of it is attached. (its not the best in the world, but i was in a rush.) I can take another one tomorrow if need be.
Thank you!
~Hayden