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

if ( browser) {
	var onImage = new MakeImageArray(3);
	var offImage = new MakeImageArray(3);
	
	onImage[1].src="images/beforeOn_1.gif";
	onImage[2].src="images/nextOn_1.gif";
	
	offImage[1].src="images/beforeOff_1.gif";
	offImage[2].src="images/nextOff_1.gif";
}

function MakeImageArray(n) {

     this.length = n
     for (var i = 1; i<=n; i++) {
        this[i] = new Image();
     }
    return this;
}
	
	
function showOn(imgName, num) {
	if ( browser) { 
		document.images[imgName].src=onImage[num].src;
	}
}

function showOff(imgName, num) {
	if ( browser) { 
		document.images[imgName].src=offImage[num].src;
	}
}