<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>");  

};