// printer aanroepen
   function printen()
    {
     var agt=navigator.userAgent.toLowerCase()
     if (agt.indexOf("msie") != -1) {
      // Internet Explorer
	  var browserv = navigator.appVersion
     if (browserv.indexOf("5.") != -1)  {
      window.print();
     } else {
       alert('Klik op File/Print of Bestand/Afdrukken.');
     }
    } else {
    // Netscape Navigator/Communicator
    if (navigator.appVersion.charAt(0)>='4') {
      window.print();
    } else {
      alert('Klik op File/Print of Bestand/Afdrukken.');
    }
   }
  }