function init() {
imagesoff = new Array(30);
imagesoff[0] = new Image();
imagesoff[0].src = "http://www.math.ucsd.edu/images/inner_default/topleftucsd.jpg";
imagesoff[2] = new Image();
imagesoff[2].src = "http://www.math.ucsd.edu/images/inner_default/mathematics_dept.jpg";
imagesoff[4] = new Image();
imagesoff[4].src = "http://www.math.ucsd.edu/images/inner_default/topbar-programs.jpg";
imagesoff[5] = new Image();
imagesoff[5].src = "http://www.math.ucsd.edu/images/inner_default/topbar-research.jpg";
imagesoff[6] = new Image();
imagesoff[6].src = "http://www.math.ucsd.edu/images/inner_default/topbar-people.jpg";
imagesoff[7] = new Image();
imagesoff[7].src = "http://www.math.ucsd.edu/images/inner_default/topbar-announcements.jpg";
imagesoff[8] = new Image();
imagesoff[8].src = "http://www.math.ucsd.edu/images/inner_default/topbar-about.jpg";
imagesoff[9] = new Image();
imagesoff[9].src = "http://www.math.ucsd.edu/images/inner_default/topbar-resources.jpg";
imageson = new Array(30);
imageson[0] = new Image();
imageson[0].src = "http://www.math.ucsd.edu/images/inner_default/topleftucsd-on.jpg";
imageson[2] = new Image();
imageson[2].src = "http://www.math.ucsd.edu/images/inner_default/mathematics_dept-on.jpg";
imageson[4] = new Image();
imageson[4].src = "http://www.math.ucsd.edu/images/inner_default/topbar-programs-on.jpg";
imageson[5] = new Image();
imageson[5].src = "http://www.math.ucsd.edu/images/inner_default/topbar-research-on.jpg";
imageson[6] = new Image();
imageson[6].src = "http://www.math.ucsd.edu/images/inner_default/topbar-people-on.jpg";
imageson[7] = new Image();
imageson[7].src = "http://www.math.ucsd.edu/images/inner_default/topbar-announcements-on.jpg";
imageson[8] = new Image();
imageson[8].src = "http://www.math.ucsd.edu/images/inner_default/topbar-about-on.jpg";
imageson[9] = new Image();
imageson[9].src = "http://www.math.ucsd.edu/images/inner_default/topbar-resources-on.jpg";
}

function switchOn(num) {
	document.images[num].src = imageson[num].src;
}

function switchOff(num) {
	document.images[num].src = imagesoff[num].src;
}