var controllo;
function apri(URL, W, H, linktype)
{
if (controllo==1){POP.window.close(); controllo=0; };

X = (screen.width - W) / 2; Y = (screen.height - H) / 2;
P = "width=" + W + ",height=" + H + ",";
P+= "top=" + Y + ",left=" + X + ",";

if (linktype > 1){ 
	P+= "scrollbars=no,status=no,resizable=no"; 
} else { 
	P+= "scrollbars=yes,status=yes,resizable=yes,toolbar=yes,menubar=yes,location=yes";  
} ;
if(URL){ POP = window.open(URL, "", P); POP.window.focus(); };
}