var base = "images/nav";
var baseSide = "images/snav";
var img = new Array();
var imgover = new Array();
var section = new Array('Home','Dyspan','Papers','Demonstrations','Patrons','Program','Special','Speaker','Registration','Venue','Travel','Visa','Info','Committees','About');
if (document.images) {
	for (i=0; i<section.length; i++) {
		img[i] = new Image;
		if (i < 5) {
			img[i].src = base + section[i] + ".gif";
		} else {
			img[i].src = baseSide + section[i] + ".gif";
		}
		imgover[i] = new Image;
		if (i < 5) {
			imgover[i].src = base + section[i] + "_on.gif";
		} else {
			imgover[i].src = baseSide + section[i] + "_on.gif";
		}
	}
}

function imageOn(imNum) {
	if (document.images) {
		document.images[section[imNum]].src = imgover[imNum].src;
	}
}

function imageOff(imNum) {
	if (document.images) {
		document.images[section[imNum]].src = img[imNum].src;
	}
}