var width = '640'; // X
var height = '550'; // Y 
var p = 'scrollbars=yes,resizable=yes,toolbar=no,menubar=no,status=yes,location=no,left=85,top=20,'+'height=' + height + ',width=' + width;
function gotoWebVPN() {
 window.open("Accesso.aspx","WebVPN",p);
}