[Zope] tens of thousands of files in Zope var directory

Hi all, We have 75,000 to 80,000 .png, .jpg and .wmf files in the Zope var directory. Where do these files come from? Are they something to do with the cache? If so how do we clean them out - there couldn't be more than 20 or 30 seperate images on our whole site and the 75,000 to 80,000 are making it difficult to backup the site. We are running Zope 2.6.2 with Plone 1.0.5. We are using a cache manager for our site. Thanks Tim Edwards Trainee Analyst Programmer Henry Walker Eltin Phone: 02 9887 6327 Fax: 02 9887 2412 Email: tim.edwards@hwe.com.au