window.onload = load_nav = function()
{
  if(location.pathname == "/")
  {
    document.getElementById('nav_home').className = "on";
  }
  else if(location.pathname.indexOf('about') != -1) {
    document.getElementById('nav_about').className = "on";
  }
  else if(location.pathname.indexOf('projects') != -1) {
    document.getElementById('nav_projects').className = "on";
  }
  else if(location.pathname.indexOf('articles') != -1) {
    document.getElementById('nav_articles').className = "on";
  }
  else if(location.pathname.indexOf('contact-us') != -1) {
    document.getElementById('nav_contact').className = "on";
  }
}