function msgbox()
{
  if (document.all)
  {
    div = document.all.messagebox.style;
    div.pixelLeft = ((document.body.clientWidth-320)/2);
    div.pixelTop = ((document.body.clientHeight-160)/2 - 10);
    div.visibility = 'visible';
  }
  else if(document.getElementById)
  {
    div = document.getElementById('messagebox');
    div.style.left = ((window.innerWidth-320)/2) + 'px';
    div.style.top = ((window.innerHeight-160)/2 - 10) + 'px';
    div.style.visibility = 'visible';
  }
  if (winonload_msgbox) { winonload_msgbox(); }
}

var winonload_msgbox = window.onload;
window.onload = msgbox;