var addBookmarkObj = {
    linkText: 'Bookmark this link',
    addTextLink: function(param) {
        var a = addBookmarkObj.makeLink(param);
        if (!a) return;
        a.appendChild(document.createTextNode(addBookmarkObj.linkText));
    },
    makeLink: function(param) {
        if (!document.getElementById || !document.createTextNode) return null;
        param = ((typeof (param) == 'string') && !isEmpty(param))
      ? param : 'tool-book';
        var cont = document.getElementById(param);
        if (!cont) return null;
        var a = document.createElement('a');
        a.href = location.href;
        if (window.opera) {
            a.rel = 'sidebar'; // Opera 7+
        } else {
            // not Opera.
            a.onclick = function() {
                addBookmarkObj.exec(this.href, this.title);
                return false;
            }
        }
        a.title = document.title;
        return cont.appendChild(a);
    },
    exec: function(url, title) {
        var ua = navigator.userAgent.toLowerCase();
        var isKonq = (ua.indexOf('konqueror') != -1);
        var isSafari = (ua.indexOf('webkit') != -1);
        var isMac = (ua.indexOf('mac') != -1);
        var buttonStr = isMac ? 'Command/Cmd' : 'CTRL';

        if (window.external && (!document.createTextNode ||
      (typeof (window.external.AddFavorite) == 'unknown'))) {
            window.external.AddFavorite(url, title); // IE/Win
        } else if (isKonq) {
            alert('You need to press CTRL + B to bookmark this site.');
        } else if (window.opera) {
            void (0); // do nothing here (Opera 7+)
        } else if (window.home || isSafari) { // Firefox, Netscape, Safari, iCab
            alert('You need to press ' + buttonStr + ' + D to bookmark our site.');
        } else if (!window.print || isMac) { // IE5/Mac and Safari 1.0
            alert('You need to press Command/Cmd + D to bookmark this site.');
        } else {
            alert('In order to bookmark this site you need to do so manually ' +
        'through your browser.');
        }
    }
}

function isEmpty(s) { return ((s == '') || /^\s*$/.test(s)); }

function nx_addWindowEvent(el, etype, fn) {
    if (el.addEventListener && (!window.opera || opera.version) && (etype != 'load')) {
        el.addEventListener(etype, fn, false);
    } else if (el.attachEvent) {
        el.attachEvent('on' + etype, fn);
    } else {
        if (typeof (fn) != "function") return;
        if (typeof (window.earlyNS4) == 'undefined') {
            // Netscape versions before 4.02
            window.earlyNS4 = ((navigator.appName.toLowerCase() == 'netscape') &&
      (parseFloat(navigator.appVersion) < 4.02) && document.layers);
        }
        if ((typeof (el['on' + etype]) == "function") && !window.earlyNS4) {
            var tempFunc = el['on' + etype];
            el['on' + etype] = function(e) {
                var a = tempFunc(e), b = fn(e);
                a = (typeof (a) == 'undefined') ? true : a;
                b = (typeof (b) == 'undefined') ? true : b;
                return (a && b);
            }
        } else {
            el['on' + etype] = fn;
        }
    }
}

nx_addWindowEvent(window, 'load', addBookmarkObj.addTextLink);