prepend youtube links with thumbnails

prepend youtube links with thumbnails

function add_youtube_thumbs() {
  var m;
  $('a').map(function() {
    m = /http:\/\/(?:(?:www|uk)\.)?youtube\.com\/watch\?v=(.+?)(?:&|$)/.exec(
      $(this).attr('href'));
    if (m) {
      $(this).prepend($('<img />').attr({
        'class' : 'youtube_thumb',
        'src' : 'http://img.youtube.com/vi/' + m[1] + '/1.jpg'
      }));
    }
  });
}