function view_sizing_chart() {
  var url = '/size-chart.html' ;

  var width = '600';
  var height = '300';

  var windowName = 'sizeWin' ;
  var featureString = ',' + 'status=no,toolbar=no,directories=no,location=no,resizable=no,scrolling=no,scrollbars=no,favorites=no,menubar=no';

  var x = Math.round((screen.availWidth - width) / 2);
  var y = Math.round((screen.availHeight - height) / 4);

  windowStuff = 'left=' + x + ',top=' + y + ',width=' + width + ',height=' + height + featureString;
  return open (url, windowName, windowStuff);
}