I have posts which are 'films', and posts which are 'news'.
The film posts have a custom field which points to a preview image of the film.
I would like to only display the image, on archive/category pages if the custom field is present.
lists posts - if it has custom field of 'thumbnail' then show "class - thumbnail".
if not, don't show "class - thumbnail".
continue with the loop.
comprende? any help most appreciated.