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

function display_loading_screen()
{
  document.getElementById("loading_screen").style.display = 'block';
}

function hide_loading_screen()
{
  document.getElementById("loading_screen").style.display = 'none';
}