Google Spreadsheet to a Google Maps Webpage

 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
  <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
    <style type="text/css">
      html { height: 100% }
      body { height: 100%; margin: 0; padding: 0 }
      #map-canvas { height: 100% }
    </style>
<!-- Acquire your google maps API Key https://developers.google.com/maps/documentation/javascript/tutorial -->
    <script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?key=AIzaSyDPahUaopfWbadpOpOLolZuPX-pX129kF4&sensor=true">
    </script>
    <script type="text/javascript">
//<![CDATA[

var map;
 function loadMapJSON(json)
 {

 for (var i = 0; i < json.feed.entry.length; i++) {
    var entry = json.feed.entry[i];


    if(entry["gsx$name"].$t) {
      var lat = parseFloat(entry["gsx$latitude"].$t);
      var lng = parseFloat(entry["gsx$longitude"].$t);
      var myLatlng = new google.maps.LatLng(lat,lng);
      var label = entry["gsx$name"].$t;
      var marker = new google.maps.Marker({
      position: myLatlng,
      map: map,
      title: label
      });
    }
  }
}

function m_getJSON() {
var mapOptions = {
          center: new google.maps.LatLng(30, 10),
          zoom: 2,
          mapTypeId: google.maps.MapTypeId.ROADMAP
        };
        map = new google.maps.Map(document.getElementById("map-canvas"),mapOptions);


  // Retrieve the JSON feed.
  var script = document.createElement('script');

// The spreadsheet should be formatted like this :
//https://docs.google.com/spreadsheet/ccc?key=0AvR75gIJvkFUdEtMSDJnY0tTN0Z0WXlhZDdhLUdJM2c&usp=drive_web#gid=0
//Acquire this URL from the Google spreadsheet by looking at File->Publish to Web->Get A Link to
//Published Data-> Choose ATOM and copy link and replace below up and add ?alt=json-in-script&ndplr=1&//callback=loadMapJSON on the end

  script.setAttribute('src', 'https://spreadsheets.google.com/feeds/list/0AvR75gIJvkFUdEtMSDJnY0tTN0Z0WXlhZDdhLUdJM2c/od6/public/values?alt=json-in-script&ndplr=1&callback=loadMapJSON');
  script.setAttribute('id', 'jsonScript');
  script.setAttribute('type', 'text/javascript');
  document.documentElement.firstChild.appendChild(script);


}

      google.maps.event.addDomListener(window, 'load', m_getJSON);
//]]>

    </script>
  </head>
  <body>
    <div id="map-canvas"/>
  </body>
</html>