Where is iDVD on Apple Mac?

I had just completed a movie on iMovie and wanted to make a DVD of it for my mother. So I clicked 'Share' > 'iDVD...' and a 'Preparing project...' message box appeared. After about an hour of processing, a 'Choose Application' message box dropped down with a list of applications - iDVD nowhere to be seen amongst them. More: http://www.mwls.com/news.php?n=113