function getElementsByClassName(c, p, t, f) {
  var found = new Array();
  var re = new RegExp('\\b'+c+'\\b', 'i');
  var list = document.getElementsByTagName(t);
  for (var i = 0; i < list.length; ++i) {
    if (list[i].className && list[i].className.search(re) != -1) {
      found[found.length] = list[i];
      if (f) f(list[i]);
    }
  }
  return found;
}


function addEvent(obj, evType, fn){
  if (obj.addEventListener){
	obj.addEventListener(evType, fn, false);
	return true;
  } else if (obj.attachEvent){
	var r = obj.attachEvent("on"+evType, fn);
	return r;
  } else {
	return false;
  }
}