Can anyone advise how to make images in columnar display position accurately and not overlap as here:

http://www.johncrummay.com/shop/inde...ex&cPath=66_68

or space themselves apart like here:

http://www.johncrummay.com/shop/inde...roducts_id=182

In the first link, we are trying to get the images to sit exactly flush with each other in a grid, but they seem to be prevented from doing so by a space to the right of the extreme right-hand image.

In the second link, we are trying to get the five additional images to sit exactly flush to each other next to the main image.

Anyone got any idea how this is achieved?

Many thanks

Robin