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How to create something like snap ?

 
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Hi.
Have you seen WordPress lately?
When you hover over a link, a tooltip appears containing an image (snap) of the refrenced URL.
I'm sure it is ajax, but how they implement it ?
Looks like magic.
 
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http://alexa.com/site/devcorner/thumbnails

Eric
 
Hussein Baghdadi
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It is not free , it seems ...
 
Eric Pascarello
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Well you could code your own app that finds a url, goes to the site, takes a screenshot saves it, and plans updates for that url in the future.

Eric
 
Hussein Baghdadi
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How to take the screen shot (using the spider) ?
 
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