getElementsByClassName() doesn’t work in old Internet Explorers like IE6, IE7, IE8

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IE6, Netscape 6+, Firefox, and Opera 7+ copy the following script in your page:

document.getElementsByClassName = function(cl) {
  var retnode = [];
  var elem = this.getElementsByTagName('*');
  for (var i = 0; i < elem.length; i++) {
    if((' ' + elem[i].className + ' ').indexOf(' ' + cl + ' ') > -1) retnode.push(elem[i]);
  }
  return retnode;
};

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