Joomla 1.6 (and now, 1.7) has advanced Joomla's codebase leaps and bounds beyond Joomla 1.5. However, for extension developers, supporting both at the same time can be difficult as keeping completely seperate codebases is sometimes necessarily to take advantage of new features. Developers are left with tough choices about which to support, and how to keep the codebase simple so that they can reach the broadest audience and not cause undue stress on either those adopting newer versions of Joomla, or those maintaining their older sites.

With Weever Apps we have the same issue, and are sharing a solution for bringing at least one feature from 1.6 back to 1.5: language support for Javascript.