function popc(nome, titolo, lar, alt, feat){
	var wwdt = screen.width;
	var hhgt = screen.height;
	var x = Math.round( (wwdt / 2) - (lar / 2) );
	var y = Math.round( (hhgt / 2) - (alt / 2) );
	window.open(nome, titolo, 'width=' + lar + ',height=' + alt + ',left=' + x + ',screenX=' + x + ',top=' + y + ',screenY=' + y +	',' + feat);
}