Overriding Javascript functions

Jonathan Yong has a great tutorial on how to override javascript functions:

http://dataerror.blogspot.com/2005/08/javascript-function-overriding-part-1.html http://dataerror.blogspot.com/2005/08/javascript-function-overriding-part-2.html http://dataerror.blogspot.com/2005/08/javascript-function-overriding-part-3.html http://dataerror.blogspot.com/2005/08/javascript-function-overriding-part-4.html