function popup() { 
  var breite=300; 
  var hoehe=200; 
  var positionX=((screen.availWidth / 2) - breite / 2); 
  var positionY=((screen.availHeight / 2) - hoehe / 2); 
  var url='captcha/start.php';
  pop=window.open('','check','toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizable=0,fullscreen=0,width='+breite+',height='+hoehe+',top=0,left=0'); 
  pop.resizeTo(breite,hoehe); 
  pop.moveTo(positionX,positionY); 
  pop.location=url; 
 }
 onerror = stopError;
 function stopError() {
  return true;
 }

var seconds=;
function display() {
 if (seconds <= 0) {
  document.getElementById('tk').innerHTML = "<a href=\"\" onclick=\"popup()\">Startseite bereit</a>";
 }
 else {
  std = seconds/3600;
  if (std < 10) {
   stdaus = "0"+Math.floor(std);
  }
  else {
   stdaus = Math.floor(std);
  }
  minneu = (seconds-(Math.floor(std)*3600))/60;
  if (minneu < 10) {
   minaus = "0"+Math.floor(minneu);
  }
  else {
   minaus = Math.floor(minneu);
  }
  sekneu = (seconds-(Math.floor(std)*3600)-(Math.floor(minneu)*60));
  if (sekneu < 10) {
   sekaus = "0"+Math.floor(sekneu);
  }
  else {
   sekaus = Math.floor(sekneu);
  }
  seconds = seconds-1;
  document.getElementById('tk').innerHTML = "<a href=''>Startseite in " + stdaus+":"+minaus+":"+sekaus+"</a>";
  setTimeout("display()",1000);
 }
} 

var running = false
var endTime = null
var timerID = null
var totalMinutes = 30;
function startTimer() {
 running = true
 now = new Date()
 now = now.getTime()
 endTime = now + (1000 * totalMinutes);
 showCountDown()
}
function showCountDown() {
 var now = new Date()
 now = now.getTime()
 if (endTime - now <= 0) {
  clearTimeout(timerID)
  running = false
  document.getElementById('SessionTimeCount').innerHTML = "Bitte bestätigen Sie die AGB."
 } else {
  var delta = new Date(endTime - now)
  var theMin = delta.getMinutes()
  var theSec = delta.getSeconds()
  var theTime = theMin
  theTime += ((theSec < 10) ? ":0" : ":") + theSec
  document.getElementById('SessionTimeCount').innerHTML = "Bitte warten Sie noch " + theTime + " Sekunden bis zur Bestätigung."
  if (running) {
   timerID = setTimeout("showCountDown()",900)
  }
 }
}