nav1_sub0_off = new Image();
nav1_sub0_off.src = "/img/nav/nav1_sub0_off.jpg";
nav1_sub0_on = new Image();
nav1_sub0_on.src = "/img/nav/nav1_sub0_on.jpg";

nav1_sub1_off = new Image();
nav1_sub1_off.src = "/img/nav/nav1_sub1_off.jpg";
nav1_sub1_on = new Image();
nav1_sub1_on.src = "/img/nav/nav1_sub1_on.jpg";

nav1_sub2_off = new Image();
nav1_sub2_off.src = "/img/nav/nav1_sub2_off.jpg";
nav1_sub2_on = new Image();
nav1_sub2_on.src = "/img/nav/nav1_sub2_on.jpg";

nav1_sub3_off = new Image();
nav1_sub3_off.src = "/img/nav/nav1_sub3_off.jpg";
nav1_sub3_on = new Image();
nav1_sub3_on.src = "/img/nav/nav1_sub3_on.jpg";