Moving a symbol with code

I'm simply trying to animate the y axis of a symbol with code. When I rollover one symbol, I'd like it to move the symbol it's inside a certain distance. Never seems to work. I've tried looking up the simple jquery syntax to change an image's y position, but it's hard to find!

This is what I have so far:

sym.$("grouped_image").animate({"top" : "+=50px"}, 500);