Decided to test out some new themes from themeroller via theme switcher 1.4.4 for osCommerce 2.3.4. I notice in the instructions that you are to take the new jquery ui file and rename it jquery-ui-###.custom.min.js. to jquery-ui-###.min.js. In my particular case the new jquery file is: jquery-ui-1.10.4.custom.min.js. This woud be be renamed: jquery-ui-1.10.4.min.js.. You are then to copy jquery-ui-1.10.4.min.js into the catalog/ext/jquery/ui/. However, there is already a file with the same name there. I take that that I should rename the old file before copying the new one into this folder. Also, I'm not quite sure what happens when you revert to a previous theme and you've replaced or renamed the original jquery-ui-###.min.js that came with it.
Sincerely,
Tadeusz