=== Substitute thumbnails ===

  * **Problem:** 
    * when you remove old files from the folders and put in new ones which have the same name
    * then the thumbnails are not exchanged in the www-version
    * but: as soon as you click on a thumbnail, the overview layout appears with the new image

  * **Explanation:**
    * digilib does not recognize if the thumbnails have been exchanged

  * **Solution:**
    * Either you delete the according thumbnails
    * or you create all thumbnails again with digilib -> please turn to the IT-Group for help

  * **Where are the thumbnails?** ...to be continued...