index.html

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta name="viewport" content="initial-scale=1.0">
<title>map</title>

<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js"> </script>
<!--
Insert an api key, like this...
<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?key=insert_api_key_here"> </script>
-->

<script type="text/javascript" src="makemap.js"> </script>

</head>

<body>


<div style="padding:6px;font-size:18px;">
    <form>
        <label for="Dataset">Choose a Dataset:</label>
        <select id="Dataset" name="Dataset" onchange="reload()">
        <option value="2019-09">2019-09</option>
		<option value="2019-10">2019-10</option>
		<option value="2019-11">2019-11</option>
		<option value="2019-12">2019-12</option>
        </select>
 
    </form>
</div>

<div id="map-canvas" style="width: 90%; height:90%;" ></div>
<br />

</body>
</html>