function bookmarkSetup() {
    var ver = navigator.appName
    var num = parseInt(navigator.appVersion)

    if ((ver == "Microsoft Internet Explorer")&&(num >= 4)) {
        document.getElementById('bookmark').textContent = 'bookmark';
        document.getElementById('bookmark').href      = 'javascript:bookmark();'
    } else {
        document.getElementById('bookmark').textContent = 'Bookmark';
    }
}
function bookmark() {
    var url = "http://www.portmanproperties.com";
    var title = "Portman Properties.com - Algarve Properties"
	if (window.sidebar) { // Mozilla Firefox Bookmark
		/*window.sidebar.addPanel(title, url,"");*/
	} else if ( window.external ) { // IE Favorite
		window.external.AddFavorite( url, title);
	} else if (window.opera && window.print) { // Opera Hotlist
		return true;
	}
    <!--window.external.AddFavorite(url,who);-->
}
function test() {
    alert('here');
    alert(document.getElementById('bookmark').textContent);
}