nav_one_on = new Image;
  nav_one_on.src = "images/nav_one_on.gif";
  nav_one_off = new Image;
  nav_one_off.src = "images/nav_one_off.gif";

nav_two_on = new Image;
  nav_two_on.src = "images/nav_two_on.gif";
  nav_two_off = new Image;
  nav_two_off.src = "images/nav_two_off.gif";

nav_three_on = new Image;
  nav_three_on.src = "images/nav_three_on.gif";
  nav_three_off = new Image;
  nav_three_off.src = "images/nav_three_off.gif";

nav_four_on = new Image;
  nav_four_on.src = "images/nav_four_on.gif";
  nav_four_off = new Image;
  nav_four_off.src = "images/nav_four_off.gif";

nav_five_on = new Image;
  nav_five_on.src = "images/nav_five_on.gif";
  nav_five_off = new Image;
  nav_five_off.src = "images/nav_five_off.gif";

nav_contact_on = new Image;
  nav_contact_on.src = "images/nav_contact_on.gif";
  nav_contact_off = new Image;
  nav_contact_off.src = "images/nav_contact_off.gif";

nav_home_on = new Image;
  nav_home_on.src = "images/nav_home_on.gif";
  nav_home_off = new Image;
  nav_home_off.src = "images/nav_home_off.gif";