var popupWindow = null; 
function apriImmagine(popupURL,w,h)
{
	finestra='popupWindow'
    if (popupWindow != null && !popupWindow.closed) popupWindow.close();
    popupWindow = window.open(popupURL,finestra,"location=no,toolbar=no,directories=no,status=no,scrollbars=no,height="+h+",width="+w);
}