var IViewer = null;

function InfoWindow(URL) {
         if (IViewer != null) {
            IViewer=null;
         }
                
        IViewer=window.open(URL,'infoViewer','height=350,width=450,toolbar=no,scrollbars=yes,location=no,directories=no,resizable=yes,copyhistory=no');
      IViewer.focus();
return false;
}