sample

<!DOCTYPE html>
<html>
  <head>
    <title>Simple click event</title>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <style>
      html, body {
        height: 100%;
        margin: 0;
        padding: 0;
      }
      #map {
        height: 100%;
      }
    </style>
  </head>
  <body>
    <div id="map"></div>
    <script>
 function initMap(){
    var locations = [['Chesapeake Bay Bridge Tunnel ', 36.9736644, -76.1095002, 1],
	['Kiptopeke', 37.1737755, -75.9748783, 2],
	['Lewisetta', 37.9979068, -76.4627303, 3],
	 [' Sewells Point', 36.9548696, -76.3268873, 5],
	 ['Wachapreague', 37.6042998,  -75.6896502, 4],
	[' Gloucester Point', 37.254033, -76.496895, 6],
	[' Colonial Beach', 38.2545737, -76.963583, 7]
     ];
	var contentarray=['<div id="content" style="width:900px; height:900px">'+
'<iframe src="https://cs.odu.edu/~mkompal/infovis/chesapeake.html" width="900" height ="800" style="overflow:hidden; overflow-y: hidden;" scrolling="no" seamless="seamless" ></iframe>'+
      '</div>','<div id="content1" style="width:900px; height:900px">'+
'<iframe src="../infovis/kiptopeke.html" width="900" height ="800" style="overflow:hidden; overflow-y: hidden;" scrolling="no" seamless="seamless"></iframe>'+
      '</div>','<div id="content2" style="width:900px; height:900px">'+
'<iframe src="../infovis/lewisette.html" width="900" height ="800" style="overflow:hidden; overflow-y: hidden;" scrolling="no" seamless="seamless" ></iframe>'+
      '</div>','<div id="content3" style="width:900px; height:900px">'+
'<iframe src="../infovis/sewellsPoint.html" width="900" height ="800" style="overflow:hidden; overflow-y: hidden;" scrolling="no" seamless="seamless" ></iframe>'+
      '</div>','<div id="content4" style="width:900px; height:900px">'+
'<iframe src="../infovis/wachapreague.html"width="900" height ="800" style="overflow:hidden; overflow-y: hidden;" scrolling="no" seamless="seamless" ></iframe>'+
      '</div>','<div id="content5" style="width:800px; height:600px">'+
'<iframe src="../last2/gloucesterPoint.html" width="800" height ="600" style="overflow:hidden; overflow-y: hidden;" scrolling="no" seamless="seamless" ></iframe>'+
      '</div>',
	  '<div id="content6" style="width:800px; height:600px">'+
'<iframe src="../last2/colonialBeach.html" width="900" height ="600" style="overflow:hidden; overflow-y: hidden;" scrolling="no" seamless="seamless" ></iframe>'+
      '</div>'
	
	
	
	];

var map = new google.maps.Map(document.getElementById('map'), {
      zoom: 10,
      center: new google.maps.LatLng(37.76487, -76.41948),
      mapTypeId: google.maps.MapTypeId.ROADMAP
    });

//var contentString = '<div id="content" style="width:500px; height:900px">'+
//'<iframe src="../meysamwork/chesaline.html" width="490" height ="800" ></iframe>'+
      //'</div>';

var infowindow = new google.maps.InfoWindow({
   // content: contentString
	 
  });

var marker, i;

for (i = 0; i < locations.length; i++) {  
      marker = new google.maps.Marker({
        position: new google.maps.LatLng(locations[i][1], locations[i][2]),
        map: map
      });

google.maps.event.addListener(marker, 'click', (function(marker, i) {
        return function() {
          infowindow.setContent(contentarray[i]); 
          infowindow.open(map, marker);
        }
      })(marker, i));
    }
	}
  </script>
    </script>
    <script async defer
    src="https://maps.googleapis.com/maps/api/js?key=AIzaSyDvOJylHDqfwpKWDNqKP6faRh2102BtXHc&callback=initMap">
    </script>
  </body>
</html>