Standalone ckFinder Image caching

I've read through the forums and tried several searches but cannot seem to locate an issue similar to the one I am having.

I am using ckFinder for ColdFusion 1.2.3 on a Windows 2003 enterprise, ColdFusion 8 enterprise server.

I have a web page that allows a user to select from a list of multiple themes, each time they select a theme the page refreshes and displays a new set of images as the location of the images folder is dynamically set. I decided to try and integrate the standalone version of ckFinder to manage the images in the folders, just dynamically changing the baseURL for ckFinder ever time the page reloads.

Almost everything works fine; the images can be renamed, uploaded, downloaded, deleted, etc. and the appropriate images are being managed for the appropriate folder as indicated by the theme choice made by the user.

The issue is If you switch between themes the thumbnail images displayed in the ckFinder do not change (each theme has all the same images (image1.gif, image2,gif, etc.) named exactly the same, just different looks), although if you click on the "view" of the thumbnail when it is put into the popup window it will show correctly. If the user clears the cache on their local browser and refreshes the page the thumbnails will again show correctly.

Example:
Theme A Image One --> Blue Circle
Theme B Image One --> Red Circle

User clicks on Theme A and sees the thumbnail of image one (a blue circle), they click on the view to pop it up in the window and it shows a blue circle.

User then clicks on Theme B and see the thumbnail of image one (again a blue circle, when a red circle would be expected), they click on the view to pop it up in the windows and it shows a RED circle, as would be expected.

If the user clears their local cache (browser) and refreshes the page the thumbnail of image one will show as a red circle as expected.

My initial thought is to create multiple instances of ckFinder and load between them (slightly painful) or modify ckFinder to create an instance of itself with a unique name and call between instances to force reloads (again not my first choice).

I'm hoping that there is something I'm missing that could prove an easier solution.