function openokno(w,h)
  {
  w += 20;
  h += 30;
  var x = (screen.availWidth - w) / 2;
  var y = (screen.availHeight - h -100) / 2;
  newwin=window.open('','okno', 'width='+ w +',height='+ h +',left='+ x +',top='+ y +',resizable=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,toolbar=0');
  newwin.focus();
  }