To obtain the best results when exporting your iMovies to work with iDVD, upgrade your version of iMovie to version 2.0.3 or later. After upgrading to iMovie 2.0.3, re-export your movies.
In iMovie 2.0.3, choose Export Movie from the File menu and then choose For iDVD from the "Export to" pop-up menu.
This document contains information from Help Center, the help system included with your computer.