nav_home = new Image();
nav_home.src = "images/nav_home_on.gif";

nav_why = new Image();
nav_why.src = "images/nav_why_on.gif";

nav_services = new Image();
nav_services.src = "images/nav_services_on.gif";

nav_news = new Image();
nav_news.src = "images/nav_news_on.gif";

nav_contact = new Image();
nav_contact.src = "images/nav_contact_on.gif";