[Zope] Images showing as pages in web log stats / analysis

Hi Images and other non-html objects in Zope have no obligation to end in a certain extension, e.g. .jpg. This is causing us trouble with web log analysis: images are showing up as pages and badly distorting the usage statistics. Has anyone found a web stats packages that can be configured to understand what a 'page' is, e.g. looking at the content-type header, which can be logged by Apache? The only contingency we have is to pre-process the logs and append extensions ourselves before passing to the web stats package, but this is not an ideal solution as there are commercial issues related to advertising etc. - they don't like the logs being messed with. Any suggestions welcome. Thanks, Felix.