var base = "../images/links/";
browser = (navigator.appName == "Netscape" && parseInt(navigator.appVersion) >= 3 || navigator.appName == "Microsoft Internet Explorer" && parseInt(navigator.appVersion) >= 4);

function callPicture(imgName) {
	if (browser) {
		imgOn = base + imgName + "_on.gif";
		document[imgName].src = imgOn;
		}
}

function resetPicture(imgName) {
	if (browser) {
		imgOff = base + imgName + "_off.gif";
		document[imgName].src = imgOff;
	}
}