[Typo3] Extension which switches images

[Carlos Rodriguez]

Hi folks out there,

I am searching an extension where I can input, lets say 10 pictures 
colored and 10 pictures, and the same pictures as grayscaled.
Now I want the output to be like this:

Pictures are outputted with a different link for ech picture, but when 
hovering the image the grayscaled pic should be shown.

Anyone done that before? Any hints? Maybe existing extensions?
Thanks