> Is there any way to disable the "X" button used for closing the page?
> 
> Likewise, can I stop a user from closing the page by double-clicking the 
=
> icon in the top left hand corner?

In JavaScript can use onUnload function.

But someone have use something that:
http://www.cool-condoms.com/coolplayer.html
if someone know how it is done - it could be very useful.