t_w = 604;
    t_x = (screen.width - t_w) / 2;
    t_h = 554;
    t_y = ((screen.height - 45) - t_h) / 2;
    if (t_y < 0)
    	t_y = 0;
    cartella = "imgdatabase/" ; 
	lettera = "" ; 
	numero = 3 ;

		
function pop_window_iso(URL)
	{
	 
	   win = window.open(URL,'name',"toolbar=no,left=" + t_x + ",top=" + t_y + ",width=" + t_w + ",height=" + t_h + ",directories=no,status=no,scrollbars=no,resizable=0,menubar=no,location=no,copyhistory=no");
	 
	 win.focus();
	 
	}