[inteliboy1]

True, it'd be easy for me to change the filename of the css, or edit the TPL file, but this for the owner/client to manage. Didn't realise X-Cart didn't have a simple way for a user to swap themes until this week, and now too far into the project.

Logically I can see how it could be done, though just don't have the php/smarty skills to do so:

An extra "Select Main CSS file" drop down field in the admin-> option saved in the DB -> if/else statements in tpl to load the correct CSS file.