var navr1on = new Image(); navr1on.src = 'images_usfsg/nav1_over.jpg';
var navr1off = new Image(); navr1off.src = 'images_usfsg/nav1.jpg';
var navr2on = new Image(); navr2on.src = 'images_usfsg/nav2_over.jpg';
var navr2off = new Image(); navr2off.src = 'images_usfsg/nav2.jpg';
var navr3on = new Image(); navr3on.src = 'images_usfsg/nav3_over.jpg';
var navr3off = new Image(); navr3off.src = 'images_usfsg/nav3.jpg';
var navr4on = new Image(); navr4on.src = 'images_usfsg/nav4_over.jpg';
var navr4off = new Image(); navr4off.src = 'images_usfsg/nav4.jpg';
var navr5on = new Image(); navr5on.src = 'images_usfsg/nav5_over.jpg';
var navr5off = new Image(); navr5off.src = 'images_usfsg/nav5.jpg';
var navr6on = new Image(); navr6on.src = 'images_usfsg/nav6_over.jpg';
var navr6off = new Image(); navr6off.src = 'images_usfsg/nav6.jpg';
var navr7on = new Image(); navr7on.src = 'images_usfsg/nav7_over.jpg';
var navr7off = new Image(); navr7off.src = 'images_usfsg/nav7.jpg';
var navr8on = new Image(); navr8on.src = 'images_usfsg/nav8_over.jpg';
var navr8off = new Image(); navr8off.src = 'images_usfsg/nav8.jpg';