Way to monitor website and taking screenshot on error

is anyone know a way to monitor a website (check for specific content, response time, response status code), and take a screenshot of the "monitor ressource" website (for example on firefox).

On failure, the screenshot is saved, sent by mail, etc...

I know how to take screenshot of a website, I know how to monitor website, but I don't know how to do it at the same time.

Is开发者_开发问答 anyone already try to do the same thing ??

Thanks for your help!

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This is all you need: http://seleniumhq.org/