Code:

 

<script type="text/javascript">
/*
Front Page as Portal v2.5
Created by iFusion
*/

var loc = window.location
if(document.referrer.match(location.pathname) == null && loc.href.match(/\?[\&\w+|\w+]/) == null){
var strPos = "";
if(loc.href.match(/index.php(\?|)/i) != null){
strPos += (RegExp.$1 == "?") ? "" : "?";
} else {
strPos += ( (loc.href.lastIndexOf("/") + 1 == loc.href.length) ? "" : "/") + "index.php?";
}
loc.href+=strPos + "act=site"
}</script>