function setImage(btn, img, navstatus)
  {
   document.getElementById(btn).src=img.src;
   if (navstatus==1)
    {
     resetSubNavs();
     if (document.getElementById('sub'+btn))
      {
       document.getElementById('sub'+btn).style.display='block';          
      }
    }
  }

 function resetSubNavs()
  {
   document.getElementById('subnav02').style.display='none';
   document.getElementById('subnav03').style.display='none';
   document.getElementById('subnav04').style.display='none';
   document.getElementById('subnav05').style.display='none';
   document.getElementById('subnav06').style.display='none';
  }

 function showScreenshot(img)
  {
   document.getElementById('img_screenshot').src=img;
   document.getElementById('div_screenshot').style.display='block';
  }

 function openMyServices()
 {
  var win;
  win = window.open('http://www.ndg.de/myservices', 'ndg_myservices', 'width=950,height=700,toolbar=no,addressbar=no,statusbar=no,scrolling=no');
  win.focus();
 }