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;
}