document.getElementsByClassName = function(name) {
  var results = new Array();
  var elems = document.getElementsByTagName("*");
  for (var i=0; i<elems.length; i++) {
    if (elems[i].className.indexOf(name) != -1) {
      results[results.length] = elems[i];
    }
  }
  return results;
};

init = function(){
var ourspans=document.getElementsByClassName('newwindow')
  for (var i=0; i<ourspans.length; i++) {
    ourspans[i].getElementsByTagName('a')[0].onclick=function(){window.open(this.href);return false;};
    ourspans[i].getElementsByTagName('a')[0].title="Opens in a new window";
  }
}
window.onload=init;