function select_nav() {
   var page_to_nav_id = new Array();
   var url = document.URL;
	   page_to_nav_id["index.php"] = "home";
	   page_to_nav_id["system.php"] = "system";
	   page_to_nav_id["franchise.php"] = "franchise";
	   page_to_nav_id["contact.php"] = "contact";

   var parts = url.split('/');
   var page = parts[parts.length - 1];
   id = page_to_nav_id[page];
   var link = document.getElementById(id);
   link.className=("menuSelected");
}