nav1on = new Image(); 
nav1on.src = "images/nav1_on.gif";
nav1off = new Image(); 
nav1off.src = "images/nav1.gif";

nav2on = new Image(); 
nav2on.src = "images/nav2_on.gif";
nav2off = new Image(); 
nav2off.src = "images/nav2.gif";

nav3on = new Image(); 
nav3on.src = "images/nav3_on.gif";
nav3off = new Image(); 
nav3off.src = "images/nav3.gif";

nav3_1on = new Image(); 
nav3_1on.src = "images/nav3_1_on.gif";
nav3_1off = new Image(); 
nav3_1off.src = "images/nav3_1.gif";

nav3_2on = new Image(); 
nav3_2on.src = "images/nav3_2_on.gif";
nav3_2off = new Image(); 
nav3_2off.src = "images/nav3_2.gif";

nav3_3on = new Image(); 
nav3_3on.src = "images/nav3_3_on.gif";
nav3_3off = new Image(); 
nav3_3off.src = "images/nav3_3.gif";

nav4on = new Image(); 
nav4on.src = "images/nav4_on.gif";
nav4off = new Image(); 
nav4off.src = "images/nav4.gif";

nav5on = new Image(); 
nav5on.src = "images/nav5_on.gif";
nav5off = new Image(); 
nav5off.src = "images/nav5.gif";

nav5_1on = new Image(); 
nav5_1on.src = "images/nav5_1_on.gif";
nav5_1off = new Image(); 
nav5_1off.src = "images/nav5_1.gif";

nav5_2on = new Image(); 
nav5_2on.src = "images/nav5_2_on.gif";
nav5_2off = new Image(); 
nav5_2off.src = "images/nav5_2.gif";