function popup(url, name, width, height) {
    x = parseInt((screen.width - width) / 2);
    x = x.toString();
    y = parseInt((screen.height - height) / 2);
    y = y.toString();

    options = "width="+width+",height="+height+",left="+x+",top="+y+",toolbar=0,location=0,directories=0,status=0,menuBar=0,scrollBars=1,resizable=0";
    myPopup = window.open(url, name, options);
    myPopup.focus();
  }


  function popupSimple(url, name, width, height) {
    x = parseInt((screen.width - width) / 2);
    x = x.toString();
    y = parseInt((screen.height - height) / 2);
    y = y.toString();

    options = "width="+width+",height="+height+",left="+x+",top="+y+",toolbar=0,location=0,directories=0,status=0,menuBar=0,scrollBars=0,resizable=0";
    myPopup = window.open(url, name, options);
    myPopup.focus();
  }