Get thumbnail of YouTube video link using Javascript

custom_thumbnails

function getScreen( url, size ) {
     if(url === null){
         return "";
     }
     size = (size === null) ? "big" : size;
     var vid;
     var results;
     results = url.match("[\\?&]v=([^&#]*)");
     vid = ( results === null ) ? url : results[1];
     if(size == "small"){
         return "http://img.youtube.com/vi/"+vid+"/2.jpg"; 
     }
     else {
         return "http://img.youtube.com/vi/"+vid+"/0.jpg"; 
     }
}
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