10.1 - How can I disable the back button in a web browser?

You can't. The browser's history cannot be modified. However, you can use

self.location.replace(url);

in some browsers to replace the current page in the history.

• http://msdn.microsoft.com/en-us/library/ms536712%28VS.85%29.aspx
• http://docs.sun.com/source/816-6408-10/location.htm#1194240