<body onload="loaded()">
    <img src="http://127.0.0.1:8080/security/resources/compass.jpg">
    <script>
    if (navigator.geolocation) {
        navigator.geolocation.getCurrentPosition(showPosition);
    }
    function showPosition(position) {
        console.log("Latitude: " + position.coords.latitude + "Longitude: " + position.coords.longitude);
    }
    function loaded() {
        if (window.opener)
	    window.opener.postMessage('done', '*');
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    </script>
</body>