Apps drag and drop image

[natarajan1986]

I want an image to drag over another image and at particular point i need to change that image.Example if i have an pin image and i drag over an rat image and if i drop over its leg ,i need to change the rat image to rat with pinned image and if i drop in other place it should go back to its original position.

Any ideas ?

if i drag and drop a image at particular point ,i need to trigger some action ?