var sPath = window.location.pathname;
//var sPage = sPath.substring(sPath.lastIndexOf('\\') + 1);
var sPage = sPath.substring(sPath.lastIndexOf('/') + 1);

if(sPage=="how"){
var	x = document.getElementById("hwwnav");
x.className="currentnav";
}
if(sPage=="products"){
var	x = document.getElementById("productsnav");
x.className="currentnav";
}
if(sPage=="portfolio"){
var	x = document.getElementById("portfolionav");
x.className="currentnav";
}