Syntax
document.links[num].port
The port property contains just the port specified in the URL. This property is a read/write string.
<html>
<body>
<form name="port">
<input name="portType"
type="radio"
checked
onClick="updateLinks('8080')">Port 8080<br>
<input name="portType"
type="radio"
onClick="updateLinks('4545')">Port 4545
</form>
<map name="plantMap">
<area name="plant" coords="1,1,48,48" href="http://www.java2s.com" target="_top">
</map>
<img src="http://www.java2s.com/style/logo.png" align="top"
height="50" width="50" usemap="#plantMap">
<hr>
<script language="JavaScript">
<!--
function updateLinks(portSetting)
{
document.links[0].port=portSetting;
}
-->
</script>
</body>
</html>