No allora e` viceversa: quando entri in questo script, se la finestra esiste gia` la chiudi prima di aprirne una nuova.
codice:
var win = null;
function NewWindow(mypage,myname,w,h,scrollbar){
if(win && !win.closed) win.close();
var LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
var TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
var settings = 'height='+h+ ',width='+w;
settings += ',top='+TopPosition+ ',left='+LeftPosition;
settings += ',scrollbars=yes';
win = window.open(mypage,myname,settings)
win.focus();
}