The tocjs plugin is designed to be integrated into the DITA Open Toolkit so that you have tocjs as a registered transtype. This transtype can then be used in conjunction with the XHTML output. There are some known issues, and likely many unknown issues. Please report any issues to smckenzie23@gmail.com. You may also be able to find people who can help on the dita-users Yahoo! Group. The plugin has been integrated with the default DITA-OT distribution since DITA-OT version 1.5 in December, 2009.