function popWindow(url, name, height, width) {

  var str = "height=" + height + ",innerHeight=" + height;
  str += ",width=" + width + ",innerWidth=" + width;


  if (window.screen) {
    var ah = screen.availHeight - 30;
    var aw = screen.availWidth - 10;

    var xc = (aw - width) / 2;
    var yc = (ah - height) / 3;

    str += ",left=" + xc + ",screenX=" + xc;
    str += ",top=" + parseInt(yc) + ",screenY=" + parseInt(yc);
  }
//alert(name.replace(' ','')) ;
  window.open('presenter.php?l='+url+'&w='+width+'&h='+height, name.replace(/ /g,''), str);
//  window.open('presenter.php?l='+url+'&w='+width+'&h='+height);
}