var dependentWindow=null;

function openWindow(url)
{

	sizeHwin=768;
	sizeWwin=600;

	dependentWindow=window.open(url,"","height="+sizeHwin+",width="+sizeWwin+",status=yes,resizable=yes,scrollbars=yes,top="+((screen.height-sizeHwin)/2)+",left="+((screen.width-sizeWwin)/2));
}

/* Apertura finestra applicativa (login): l'apertura e' consentita solo se non esiste gia' un'altra
   finestra aperta e se questa finestra non e' la finestra principale applicativa */
function openApp(url)
{
   try
   {
			if (dependentWindow==null || dependentWindow.closed)
				openWindow(url);
			else
			{
				dependentWindow.close();
				openWindow(url);
			}
	 }
	 catch (e)
	 {
		 if (dependentWindow!=null) dependentWindow.close();
		 openWindow(url);
	 }
}