This feature is an easy to use one line code that returns the Thumbnail of a specific video ID. If you want to retrieve a thumbnail for a specific video, simply use the following line:
Http://www.metacafe.com/thumb/[Video ID Number].jpg

How do I find my Video ID number, then? – To find your video ID number, access your video from the Website and watch the address line:

So if the Video’s URL is:
http://www.metacafe.com/watch/146123/lightning_strikes_the_empire_state_building/

The video ID is 146123. The Thumbnail URL in this case would be:
http://www.metacafe.com/thumb/146123.jpg

And will look like this: