Currently prosilver/subsilver2 is using T_TEMPLATE_PATH to call a Javascript file, but when you are using the template inheritance feature you always need to place Javascript files into the Style Template folder, since it is calling the template name of the installed Style Template name, when you are using the T_SUPER_TEMPLATE_PATH it is using the template name where you inheritance from, and when that is not available it will call the Template name of the installed Style.

I will post a patch in a few moments that fix this.