Update: 2006 Jul 10 - Fixed Firefox 2.0 problem and added ability to add a custom content ready function, DOMContentLoaded for Browsers, Part III
Update: 2006 Nov 28 - Changed code to support IE and https.
Update: 2006 Nov 21 - Added code to support IE and https.
Update: 2006 Jul 4 - Added Safari and KHTML specific code to load DOMContentLoaded events.
Update: 2006 Jun 26 - Code works in Opera 9. Now you can speed up onload events in most grade A browsers by using DOMContentLoaded/ContentReady events.