nav0on = new Image(); 
nav0on.src = "images/nav_btn0_on.gif";
nav0off = new Image(); 
nav0off.src = "images/nav_btn0_off.jpg";

nav1on = new Image(); 
nav1on.src = "images/nav_btn1_on.gif";
nav1off = new Image(); 
nav1off.src = "images/nav_btn1_off.jpg";

nav1_1on = new Image(); 
nav1_1on.src = "images/snav1_btn1_on.gif";
nav1_1off = new Image(); 
nav1_1off.src = "images/snav1_btn1_off.gif";

nav1_2on = new Image(); 
nav1_2on.src = "images/snav1_btn2_on.gif";
nav1_2off = new Image(); 
nav1_2off.src = "images/snav1_btn2_off.gif";

nav1_3on = new Image(); 
nav1_3on.src = "images/snav1_btn3_on.gif";
nav1_3off = new Image(); 
nav1_3off.src = "images/snav1_btn3_off.gif";

nav2on = new Image(); 
nav2on.src = "images/nav_btn2_on.gif";
nav2off = new Image(); 
nav2off.src = "images/nav_btn2_off.jpg";

nav3on = new Image(); 
nav3on.src = "images/nav_btn3_on.gif";
nav3off = new Image(); 
nav3off.src = "images/nav_btn3_off.jpg";

nav4on = new Image(); 
nav4on.src = "images/nav_btn4_on.gif";
nav4off = new Image(); 
nav4off.src = "images/nav_btn4_off.jpg";

nav5on = new Image(); 
nav5on.src = "images/nav_btn5_on.gif";
nav5off = new Image(); 
nav5off.src = "images/nav_btn5_off.jpg";

nav5_1on = new Image(); 
nav5_1on.src = "images/snav5_btn1_on.gif";
nav5_1off = new Image(); 
nav5_1off.src = "images/snav5_btn1_off.gif";

nav5_2on = new Image(); 
nav5_2on.src = "images/snav5_btn2_on.gif";
nav5_2off = new Image(); 
nav5_2off.src = "images/snav5_btn2_off.gif";

nav6on = new Image(); 
nav6on.src = "images/nav_btn6_on.gif";
nav6off = new Image(); 
nav6off.src = "images/nav_btn6_off.jpg";

nav6_1on = new Image(); 
nav6_1on.src = "images/snav6_btn1_on.gif";
nav6_1off = new Image(); 
nav6_1off.src = "images/snav6_btn1_off.gif";

nav6_2on = new Image(); 
nav6_2on.src = "images/snav6_btn2_on.gif";
nav6_2off = new Image(); 
nav6_2off.src = "images/snav6_btn2_off.gif";

nav7on = new Image(); 
nav7on.src = "images/nav_btn7_on.gif";
nav7off = new Image(); 
nav7off.src = "images/nav_btn7_off.jpg";

nav7_1on = new Image(); 
nav7_1on.src = "images/snav7_btn1_on.gif";
nav7_1off = new Image(); 
nav7_1off.src = "images/snav7_btn1_off.gif";

nav7_2on = new Image(); 
nav7_2on.src = "images/snav7_btn2_on.gif";
nav7_2off = new Image(); 
nav7_2off.src = "images/snav7_btn2_off.gif";

nav7_3on = new Image(); 
nav7_3on.src = "images/snav7_btn3_on.gif";
nav7_3off = new Image(); 
nav7_3off.src = "images/snav7_btn3_off.gif";