function index_init()
{
  bg_resize();
}
function bg_resize()
{
  var bg_div = document.body;
  var size = getObjectSize(window);
  var f1 = size.width / 1168;
  var f2 = size.height / 766;
  var f = Math.max(f1,f2);
  var width = Math.floor(1168 * f);
  var height = Math.floor(766 * f);
  bg_div.style.backgroundSize = width + "px "+height+"px";
}
function go_home()
{
  if (arguments.length > 0)
  {
    if (arguments[0] !== null)
    {
      window.location.href = arguments[0];
    }
    else
    {
      history.back();
    }
  }
  else
  {
    history.back();
  }
}