Javascript cross domain - “allow” other domains?

Question

Description of steps

1. Write \"callback\" function on my custom page in my domain (called \"MyCallbackCallback\", for the sake of argument)

Answer 1

Have a look at Cross-Domain AJAX requests:

• https://developer.mozilla.org/En/HTTP_Access_Control
• http://msdn.microsoft.com/en-us/library/dd573303%28v=vs.85%29.aspx

JSONP is the only method compatible with older browsers though.