function bookmark(url,title){
  if ((navigator.appName == "Microsoft Internet Explorer") && 
  (parseInt(navigator.appVersion) >= 4)) {
  window.external.AddFavorite(url,title);
  } 
  else {if (navig=="Firefox") {
    window.sidebar.addPanel(title,url,"");
  } 
  else {
    alert("El vostre navegador es '" + navig + "'. En aquest cas, heu d'usar CTRL + D.");
  }
}
}