Just dropping by (I'm not an FM user) to announce that I have made a conveniently browseable version of the Javascript Reference for FM 12, in the formats HTML (lots of files) and CHM (single file in Windows Help format; non-Windows users will need a CHM viewer such as iCHM for Mac). Thanks go to Rick Quatro (http://frameautomation.com) for his support.
Downloads are available at Indesign JavaScript Help -- scroll down to "New: FrameMaker 12", and the HTML files can also be browsed online at Adobe FrameMaker-12 Object Model JS: Table of Contents (with additional thanks to John Hawkinson for the generous donation of bandwidth).