That's the all you need to display a google map in your website. Let's put those steps together.
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
<title>Google Maps</title>
<script type="text/javascript" src="http://maps.google.com/maps?file=api&v=2&sensor=false&key=
ABQIAAKLPDUET0Qt7v3VcSk6JNU1sBSM5jMcmVqUpI7aqV99cW1cHHCiThQYkcZUPRJn9vy_TWxWvuLbBfSGDw"></script>
</head>
<body onunload="GUnload()">
Google map goes here:
<div id="map" style="width: 550px; height: 450px"></div>
<script type="text/javascript">
// Display the map, with the initial location
var map = new GMap2(document.getElementById("map"));
map.setCenter(new GLatLng(37.4419, -122.1419), 8);
</script>
</body>
</html>
