How to Load XML MC when button Pressed

How to Load XML MC when button Pressed. i had a Button and one MC That mc contains

http://www.kirupa.com/developer/mx2004/xml_flash_photogallery.htm

code.

when i run the movie . the XML loaded in runtime , but i need when i Pressed the button then it load XML MC. IS it Possible?

and where do i keep that XML MC ? Timeline Or Library?