Replacing an existing image via the admin interface Have access to a Drupal 6 admin and attempting to replace a single image via the admin interface. My understanding is that to just replace an existing image that I'll need to access the sever directly. Is there any way to edit (aka replace) an existing image via the admin interface?

Might be worth noting that one reason I want to replace the image, and not just upload a new one is due to the fact that the image is referenced via template, and not in a block, page, etc.
If the image is referenced via a template, there is no (easy) way to replace it via the CMS.  You will need access to the file system, like FTP access. 

Otherwise, you could look at finding or writing a module that gave you full access to the filesystem via the Drupal CMS.  This would be.. difficult and dangerous.