function openNewWin(URL) {
  var winl      = (screen.width-650)/2;
  var wint      = (screen.height-500)/2;
  var settings  ='height=500,';
      settings +='width=650,';
      settings +='top='+wint+',';
      settings +='left='+winl+',';
      settings +='scrollbars=yes,';
      settings +='resizable=no,';
      settings +='toolbar=no';
  window.open(URL, 'child_win', settings);
}