super(source); this.type = type; this.url = url; this.description = description; this.element = element;
this (source, type, url, null, null);
  public HyperlinkEvent(Object source, EventType type, URL url,			String description, Element element)  {    super(source);    this.type = type;    this.url = url;    this.description = description;    this.element = element;  }