URL = window.location.href; 
indexhtml = (URL.indexOf('index.') > -1); 
productshtml = (URL.indexOf('products.') > -1); 
serviceshtml = (URL.indexOf('services.') > -1);
referenchtml = (URL.indexOf('referenc.') > -1); 
site_maphtml = (URL.indexOf('site_map.') > -1);  

 

window.onload = function navigations(){ 
if (indexhtml) { 
var x=document.getElementById("home"); 
x.className = 'highlight_class'; 
} 

else if (productshtml){ 
var x=document.getElementById("products"); 
x.className = 'highlight_class'; 
} 

else if (serviceshtml){ 
var x=document.getElementById("services"); 
x.className = 'highlight_class'; 
} 

else if (referenchtml){ 
var x=document.getElementById("referenc"); 
x.className = 'highlight_class'; 
} 

else if (site_maphtml){ 
var x=document.getElementById("site_map"); 
x.className = 'highlight_class'; 
} 

}