Screen Capture website and import to flash

I build flash ads, so my swf files are just a small portion of the entire website. What I am wanting to do is
somehow to take a screenshot of the entire webpage and import that into flash so that i can manipulate a
live website in flash. My ads display on various pages so I can’t simply fake the website in a flash file and overlay it on top of the site, i need to somehow pull in the content of the site.
I’ve searched all over the internet for a way to do this and have yet to find a way, so i thought i’d ask for help.
I understand that i may need some outside Javascript or server side scripts to do this, but if anyone has any ideas it would be very much appreciated!