var activeStep = 0;
var tourImages = new Array(4);

var tourSteps = [
 ['Img1', 'Images/Tour/tour1dk.jpg', 'Images/Tour/tour1lt.jpg', 'Images/Tour/tour1.jpg'],
 ['Img2', 'Images/Tour/tour2dk.jpg', 'Images/Tour/tour2lt.jpg', 'Images/Tour/tour2.jpg'],
 ['Img3', 'Images/Tour/tour3dk.jpg', 'Images/Tour/tour3lt.jpg', 'Images/Tour/tour3.jpg'],
 ['Img4', 'Images/Tour/tour4dk.jpg', 'Images/Tour/tour4lt.jpg', 'Images/Tour/tour4.jpg']
 ];

function preloadImages()
{
  if (document.images) {
    for (i=0; i < tourSteps.length; i++) {
      tourImages[i] = new Image();
      tourImages[i].src = tourSteps[i][3];
    }
  }
}

function activateTourStep(stepID)
{
  if (activeStep != null) {
    document.getElementById(tourSteps[activeStep][0]).src = tourSteps[activeStep][1];
  }
  activeStep = stepID;
  document.getElementById(tourSteps[activeStep][0]).src = tourSteps[activeStep][2];
  document.getElementById('Img5').src = tourSteps[activeStep][3];
  
  //final step
  if (activeStep == 3) {
    document.getElementById('tour4Emailbox').style.display = "block";
  }
  else {
    document.getElementById('tour4Emailbox').style.display = "none";
  }
}