function getBrowserInfo() {
  var t,v = undefined;

  if (window.chrome) t = 'Chrome';
  else if (window.opera) t = 'Opera';
  else if (document.all) {
  t = 'IE';
  var nv = navigator.appVersion;
  var s = nv.indexOf('MSIE')+5;
  v = nv.substring(s,s+1);
  }
  else if (navigator.appName) t = 'Netscape';

  return {type:t,version:v};
 }

 function bookmark(a){
  var url = window.document.location;
  var title = window.document.title;
  var b = getBrowserInfo();

  if (b.type == 'IE' && 8 >= b.version && b.version >= 4) window.external.AddFavorite(url,title);
  else if (b.type == 'Opera') {
  a.href = url;
  a.rel = "sidebar";
  a.title = url+','+title;
  return true;
  }
  else if (b.type == "Netscape") window.sidebar.addPanel(title,url,"");
  else alert("Нажмите CTRL-D, чтобы добавить страницу в закладки.");
  return false;
 }