(function()
{
  if (window.addEventListener) {
    window.addEventListener("load", hideLoadingScreen, false);
  } else {
    window.attachEvent("onload", hideLoadingScreen);
  }
})();

function displayLoadingScreen() {
  document.getElementById("loading_screen").style.display = 'block';
  parent.frames['photos'].scrolling = 'no';
}

function hideLoadingScreen() {
  document.getElementById("loading_screen").style.display = 'none';
  parent.frames['photos'].scrolling = 'yes';
}