Loading video content into an xml file

Hi all,

Just wondering if anyone knows how I could load video content into an xml file??

What i have at d moment is an xml file loading pictures and tooltips describing the pictures!!

What I want to do is to pretty much turn the pictures into a play button so that when they are clicked, the other pictures on the screen fade out and a video screen comes up playing the relevant movie??

Anyone have any ideas how i might do this or know of any good or relevant tutorials in xml to help?? Thanks a million in advance guys!

Regards,
Derm