var layerBgDivOrgPos = 0;
var layerImDivOrgPos = 0;

var actImgIndexLng = 0;

function showIm(imgIndexLng)
{
  var layerBgDiv = document.getElementById('layerBgDiv');
  var layerImDiv = document.getElementById('layerImDiv');

  layerBgDivOrgPos = layerBgDiv.style.top;
  layerImDivOrgPos = layerImDiv.style.top;

  var scrollTop = document.body.scrollTop;

  layerBgDiv.style.top = layerBgDivOrgPos + scrollTop;
  layerImDiv.style.top = layerImDivOrgPos + scrollTop;

  layerBgDiv.style.visibility = 'visible';
  layerImDiv.style.visibility = 'visible';

  var flashHeader = document.getElementById('flashHeader');
  flashHeader.style.visibility = 'hidden';

  showImg(imgIndexLng);
}

function showImg(imgIndexLng)
{
  actImgIndexLng = imgIndexLng;
  document.popupImg.src = imageUrlArray[actImgIndexLng];
}


function showPrev()
{
  var prevImgIndexLng = actImgIndexLng - 1;
  if (prevImgIndexLng < 0) {prevImgIndexLng = imageUrlArray.length - 1};
  showImg(prevImgIndexLng);
}

function showNext()
{
  var nextImgIndexLng = actImgIndexLng + 1;
  if (nextImgIndexLng > imageUrlArray.length - 1) {nextImgIndexLng = 0};
  showImg(nextImgIndexLng);
}


function hideAll()
{
  var layerBgDiv = document.getElementById('layerBgDiv');
  var layerImDiv = document.getElementById('layerImDiv');

  layerBgDiv.style.visibility = 'hidden';
  layerImDiv.style.visibility = 'hidden';

  layerBgDiv.style.top = layerBgDivOrgPos;
  layerImDiv.style.top = layerImDivOrgPos;

  var flashHeader = document.getElementById('flashHeader');
  flashHeader.style.visibility = 'visible';

  document.popupImg.src = '/images/logo.jpg';
}