function apri(nome)
{
var w=940;
var h=565;
var x = (screen.width-w)/2;
var y = (screen.height-h)/2;
var finestra=window.open(nome,'Zoom','width=' + w +',height=' + h + ', toolbar=no,directories=no,location=no,status=no,menubar=no,copyhistory=no,scrollbars=yes,resizable=no');
finestra.moveTo(x,y);
finestra.focus();
}