var WebCamImageSource = document.getElementById( "WebCamImage").src;
var TEMPerHumFrameSource = document.getElementById( "TEMPerHumFrame").src;
var WebcamInfoText = "Aktuelles Bild vom Schweriner Innensee in ";
var CurrSecondsCount = 0;
var SecondsCount = window.location.search;
if ( SecondsCount != "")
{
  SecondsCount = SecondsCount.substr( 1, SecondsCount.length - 1);
}
else
{
  SecondsCount = 30;
}

function StartCountdown()
{
  if ( CurrSecondsCount <= 1)
  {
    var TempDate = new Date();
    document.getElementById( "WebCamImage").src = WebCamImageSource + "?" + TempDate.getTime();
    document.getElementById( "TEMPerHumFrame").src = TEMPerHumFrameSource + "?" + TempDate.getTime();

    CurrSecondsCount = SecondsCount;
  }
  else
  {
    CurrSecondsCount -= 1;
  }
  
  document.getElementById( "CountdownInputText").value = WebcamInfoText + CurrSecondsCount + " s";
   
  timerID = setTimeout( "StartCountdown()", 1000);
}