function AddFavorite() {
  if(/MSIE/.test(navigator.userAgent)) {
    window.external.AddFavorite(document.location.href,document.title);
    return false;
  }
  else if(/Mozilla/.test(navigator.userAgent)){
    if (typeof window.sidebar == "object")
      window.sidebar.addPanel (document.title, document.location.href, "");
    return false;
  }
  else if(/Opera/.test(navigator.userAgent)) {
    var a = document.createElement('A');
    if (!a) return false;
    a.setAttribute('rel','sidebar');
    a.setAttribute('href',document.location.href);
    a.setAttribute('title',document.title);
    a.click();
    return true;
  }
  else
    return false;
}