Edit in JSFiddle

JavaScript
HTML
CSS
Result

function initialize()
{
    map = new google.maps.Map(document.getElementById('map'),
    {
        center: new google.maps.LatLng(42.0540,-44.2969),
        zoom: 2,
        mapTypeId: 'roadmap'
    });

    layer = new google.maps.FusionTablesLayer(132848,
    {
        heatmap: true
    });
    layer.setMap(map);
}

<html>
<head>
<title>Google Maps API v3 : Fusion Table Layer - Heat Map</title>
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script>
<script type="text/javascript">
</script>
</head>
<body onload="initialize()">
<div id="map" style="width: 530px; height:230px">
</div>
</body>
</html>