Thanks for the tip, I'll do that. Do you know of any zopish way to render the URL of the top level directory (without knowing where you are in the folder hierarchy)? This would be more elegant as a generic solution. The plus side of not using the absolute URL is that I could have a local version of 'folderimg' if I wanted, without having a local version of the method. Kent Polk wrote:

You might want to provide your images with an absolute URL if applicable because browsers will reload the images with each document instead of caching them.