function openWindow() {
  var width = screen.width;
  var height = screen.height;

  var left = 0;
  var top = 0;

  window.open('','sisveg', 'height='+height+',width='+width+',left=0,top=0,scrollbars=yes,status=yes,toolbar=no,location=no,directories=no,menubar=no,resizable=yes,fullscreen=no');

}