Hi

Does any one know how to set small image size by percentage not pixel

For Example

If I have 2 products, one image is 500*500, another one is 600*500, OK, I set the small image at admin panel set 80W and 80H

For the first one it will display good, but the second one will be stretched.

Any idea about to set small image by original image's percentage and make the looking better ?

Thanks