We've built in a theme framework to make managing & updating your website a lot easier.
The code for the front-end template is entirely separate from the rest of the image hosting script code. That enables you to update your core site easily, even if you have made various custom changes to the site theme.
We have also implemented a theme manager which can be found within the admin area. This enables you to install new themes simply by uploading the zip file in the theme manager.
It also enables you to switch in between themes at the touch of a button. The theme preview button also enables you to view your image hosting site with the new theme before actually setting it.