add image to cart

Haven't managed to find anything on the forums - might be searching with wrong terms.

Want to be able to add small thumbnail of the product for each item in the cart when I view whats in the cart during checkout. It just needs an additional table cell at the start but I am not really good at programming and can't work out from other files which code to use to use to extract the image followed by file name, etc. It might also be good for user to click on image to enlarge it if they want to.

Thanks for any help.