function apri(sName,iWidth,iHeigh) {
var sRef;
var sPar;
var obj;
	sRef = "OpenWindow";
	sPar = "menubar=no,scrollbars=yes,resizable=yes,status=no,location=no,width="+iWidth+",height="+iHeigh;
  obj = window.open(sName,sRef,sPar);
	obj.focus();
}

function chiudi() {
  window.close();
}

function back() {
  history.back();
}