img1on = new Image();
img1on.src = "graphics/nav_figures_on.gif";
img1off = new Image();
img1off.src = "graphics/nav_figures_off.gif";

img2on = new Image();
img2on.src = "graphics/nav_cards_on.gif";
img2off = new Image();
img2off.src = "graphics/nav_cards_off.gif";

img3on = new Image();
img3on.src = "graphics/nav_dioramas_on.gif";
img3off = new Image();
img3off.src = "graphics/nav_dioramas_off.gif";

img4on = new Image();
img4on.src = "graphics/nav_members_on.gif";
img4off = new Image();
img4off.src = "graphics/nav_members_off.gif";

img5on = new Image();
img5on.src = "graphics/nav_contacts_on.gif";
img5off = new Image();
img5off.src = "graphics/nav_contacts_off.gif";

img6on = new Image();
img6on.src = "graphics/nav_forum_on.gif";
img6off = new Image();
img6off.src = "graphics/nav_forum_off.gif";