<html>
    <head>
        <script language="JavaScript">
            function refreshIt(element) {
                setTimeout(function() {
                    element.src = element.src.split('?')[0] + '?' + new Date().getTime();
                    refreshIt(element);
                }, 30000); //refresh
            }
        </script>
    </head>
    <body>
        <img src="haekuva_karttapaikka.php" name="kartta" onload="refreshIt(this)">
    </body>
</html>