There is the URL of page on the Internet. I need to get a screenshot of this page (no matter in which browser). 
I need a script (PHP, Python (even Django framework)) that receives the URL (string) and output screenshot-file at the exit (file gif, png, jpg).
UPD:
I need dynamically create a page where opposite to URL will be placed screenshot of the page with the same URL.
If you are family with Python, you can use PyQt4. This library supports to get screenshot from a url.
Convert URL to screenshot (script)