text: function initMap() {
    var uluru = {lat: -25.363, lng: 131.044};
    var map = new google.maps.Map(document.getElementById('gmap'), {
      zoom: 4,
      center: uluru
    });
    var marker = new google.maps.Marker({
      position: uluru,
      map: map
    });
  }
  
  var showGmap = document.getElementById('showGmap');
  var gmap = document.getElementById('gmap');
  
  
  gmap.body.style.display = 'none';
  
  showGmap.addEventListener('click', function(){
    gmap.body.style.display = 'block';
  });
  