Using JavaScript to create screen shots

Can anyone tell me weather JavaScript is related to creating mini snap shots of webpages?

When on the Live Journal website, I noticed, that when there is a link present in someones blog/journal page, that when you hoover the mouse pointer over the link, a small snap shot of what the webpage looks like appears.

How is this created? using JavaScript? and if so what aspects of JavaScript are involved?

Try http://www.websnapr.com/previewbubble/ !

this is more than likely not created by javascript, but by a program on a server somewhere.

as far as i know, only firefox can create screenshots with javascript, but that functionality is restricted to add-ons only...