// Function Netscape: change image to ON.
function imageOnNS(e) {
	var oldSource = e.currentTarget.src;
	var newSource = oldSource.replace('_n', '_o');
	e.currentTarget.src = newSource;
}
// Function Internet Exploror: change image to ON.
function imageOnIE() {
	var oldSource = event.srcElement.src;
	var newSource = oldSource.replace('_n', '_o');
	event.srcElement.src = newSource;
}

// Function Netscape: change image to OFF.
function imageOffNS(e) {
	var oldSource = e.currentTarget.src;
	var newSource = oldSource.replace('_o', '_n');
	e.currentTarget.src = newSource;
}
// Function Internet Exploror: change image to ON.
function imageOffIE() {
	var oldSource = event.srcElement.src;
	var newSource = oldSource.replace('_o', '_n');
	event.srcElement.src = newSource;
}

// Function: scan images for class.
var preloaded = new Array();
function setMOhandler() {
	var x = document.getElementsByTagName('img');
	for (var i=0; i < x.length; i++) {
		if (x[i].className == 'MO') {

			// Preload image with class.
			var onImageSrc = x[i].src.replace('_n', '_o');
			preloaded[preloaded.length] = new Image();
			preloaded[preloaded.length-1].src = onImageSrc;

			// Define function for mouseOver/mouseOut
			// Netscape
			if (navigator.appName == 'Netscape') {
				x[i].onmouseover = imageOnNS
				x[i].onmouseout = imageOffNS
			}
			// Internet Explorer
			else {
				x[i].onmouseover = imageOnIE
				x[i].onmouseout = imageOffIE
			}
		}
	}
}