var IE4 = (document.all) ? 1:0;
var NN6 = (document.getElementsByTagName("div")) ? 1:0;
var MAC = 0;

if (NN6 && IE4) {
	NN6 = 0;
}

if (navigator.appVersion.indexOf("Mac")!=-1 && IE4) {
	IE4 = 0;
	MAC = 1;
}

var cmail = 'cbp8@cornell.edu';

function sbuton(name) {	document.images[name].src="on.gif"; }
function sbutoff(name) { document.images[name].src="off.gif"; }
function lbuton(name) {	document.images[name].src="on2.gif"; }
function lbutoff(name) { document.images[name].src="off2.gif"; }
function tbuton(name) {	document.images[name].src="ton.gif"; }
function tbutoff(name) { document.images[name].src="toff.gif"; }
function cbuton() {	document.images['bc'].src="botclick2.gif"; }
function cbutoff() { document.images['bc'].src="botclick1.gif"; }