var industry_links_off = new Image();
  industry_links_off.src = "../images_nav/industry_links_off.jpg";
  var industry_links_on = new Image();
  industry_links_on.src = "../images_nav/industry_links_on.jpg";

  var client_log_in_off = new Image();
  client_log_in_off.src = "../images_nav/client_log_in_off.jpg";
  var client_log_in_on = new Image();
  client_log_in_on.src = "../images_nav/client_log_in_on.jpg";
  
  var emp_portal_off = new Image();
  emp_portal_off.src = "../images_nav/emp_portal_off.jpg";
  var emp_portal_on = new Image();
  emp_portal_on.src = "../images_nav/emp_portal_on.jpg";