function googleMaps(startPoint){
  var win = window.open('','map')
  var startPoint = document.getElementById(startPoint).value;
  win.location = 'http://maps.google.it/maps?f=d&hl=it&saddr='+startPoint+'&daddr=Via+Maddalena+62+25075+Nave+Brescia+&ie=UTF8&om=1';
}