function finestra(url,h_size,w_size,scroll) 
{
	if (h_size == '')
	{
		h_size = 500;
	}
	if (w_size == '')
	{
		w_size = 450;
	}		
	window.open(url,"",'toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=' + scroll + ',resizable=0,width=' + w_size + ',height=' + h_size);
}