function ack(absPath) {
    var w = 200;
    var h = 100;
    var winl = (screen.width - w) / 2;
    var wint = (screen.height - h) / 2;
    var win = window.open("", "win", "width="+w+",height="+h+",top="+wint+",left="+winl+"resizable=0");
    with (win.document) {
        open("text/html", "replace");
        write('<html>\n' +
              '<head>\n' +
              '<script language="javascript">\n'+
              ' var joomlaURL="http://www.joomla.org";\n'+
              '</script>\n'+
              '<title>Acknowledgenments</title>\n' +
              '</head>\n' +
              '<body bgcolor="#FFFFFF">\n' +
              '<div align="center"><br>\n' +
              '<span style="font-family: arial, helvetica; font-weight: bold; font-size: 12px;">Powered By</span><br>\n'+
              '<a href="javascript:void(0);" onClick="window.open(joomlaURL); self.close(); return false;" target="_blank">' + 
              '<img src="' + absPath + 'images/joomla-logo.png" border="0"></a></div>\n' +
              '</body>\n' +
              '</html>');
        close();
    }
}