function window_popup(URL, w, h) {
  var day = new Date();
  var id = day.getTime();
  w += 32;
  h += 96;
  var wleft = (screen.width - w) / 2;
  var wtop = (screen.height - h) / 2;
  if (wleft < 0) {
    w = screen.width;
    wleft = 0;
  }
  if (wtop < 0) {
    h = screen.height;
    wtop = 0;
  }
  var win = window.open(URL, id, 'toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=1,width='+w+',height='+h+',left='+wleft+',top='+wtop);
  win.resizeTo(w,h);
  win.moveTo(wleft, wtop);
  win.focus();
}