<html>
<body>
<img src="/demo/planets.gif" width="145" height="126" usemap="#planetmap">
<map name="planetmap">
<area id="venus" shape="circle" coords="124,58,8" alt="Venus" href="venus.htm">
</map>
<p>The port for the "Venus" area is:
<script>
document.write(document.getElementById('venus').port);
</script>
</p>
<p><b>Note:</b> If the port part is not specified in the URL, or is 80 (which is default), some browsers will just display 0 or nothing.</p>
</body>
</html>