<script language="JavaScript">
VIH_DisplayFormat = "%%IP%%";
VIH_DisplayOnPage = "no";
</script>
<script language="JavaScript" src="http://scripts.hashemian.com/js/visitorIPHOST.js.php"></script>

<script type="text/javascript" src="/js/clientip.js"></script>

Code
var txt = "Hello World!";

if (VIH_HostIP == "xxx.xxx.xxx.xxx") {

document.write("<p>Big: " + txt.big() + "</p>");

};