function isOpera() {
   return (navigator.userAgent.indexOf('Opera') > -1);
}

function isInternetExplorer() {
   return (navigator.userAgent.indexOf('MSIE') > -1);
}

function isFirefox() {
   return (navigator.userAgent.indexOf('Firefox') > -1);
}

// auto-bookmarks perfect-cocktails.info
function bookmark() {
	var url = 'http://www.perfect-cocktails.info';
	var title = 'Perfect Cocktails';
	var unsupported = 'Das Lesezeichen konnte nicht angelegt werden.\nBitte legen Sie das Lesezeichen manuel an.\nURL: ' + url;

	try {
     if (isInternetExplorer()) {
        window.external.AddFavorite(url, title); 
     } else if (isOpera()) {
        alert(unsupported);
     } else {
        window.sidebar.addPanel(title, url, '');
     }
  } catch (exception) {
  	 alert(unsupported);
  } 
}