function r()
{
     var p_w = document.body.offsetWidth;
     var i = Math.round((1960 - p_w)/2);
     
      var flash = document.getElementById('flash');
      var left_div = document.getElementById("nag-left");
      var right_div = document.getElementById("nag-right");
      flash.style.left = "-" + i + "px";
      left_div.style.left = "-" + i + "px";
      right_div.style.left = "-" + i + "px";
}

function start()
{
  setInterval("r();", 4);
}