bName = navigator.appName;
bVer = parseInt(navigator.appVersion);

if ((bName == "Netscape" && bVer >= 3) || (bName == "Microsoft Internet Explorer" && bVer >= 4)) {
   	 br = "n3";
} else {
  	br = "n2";
}

// Create image objects, preload all active and inactive images.
if (br == "n3") {
	var img1on = new Image();
	img1on.src = "images/home_r.gif";
	var img2on = new Image();
	img2on.src = "images/about_r.gif";
	var img3on = new Image();
	img3on.src = "images/news_events_r.gif";
	var img4on = new Image();
	img4on.src = "images/products_r.gif";
	var img5on = new Image();
	img5on.src = "images/oems_r.gif";
	var img6on = new Image();
	img6on.src = "images/n_accounts_r.gif";
	var img7on = new Image();
	img7on.src = "images/engineer_r.gif";
	var img8on = new Image();
	img8on.src = "images/contact_r.gif";
	
	var img1off = new Image();
	img1off.src = "images/home.gif";
	var img2off = new Image();
	img2off.src = "images/about.gif";
	var img3off = new Image();
	img3off.src = "images/news_events.gif";
	var img4off = new Image();
	img4off.src = "images/products.gif";
	var img5off = new Image();
	img5off.src = "images/oems.gif";
	var img6off = new Image();
	img6off.src = "images/n_accounts.gif";
	var img7off = new Image();
	img7off.src = "images/engineer.gif";
	var img8off = new Image();
	img8off.src = "images/contact.gif";
}

// Function to "activate" images.
function imgAct(imgName) {
    if (br == "n3") {
	    document[imgName].src = eval(imgName + "on.src");
    }
}

// Function to "deactivate" images.
function imgInact(imgName) {
    if (br == "n3") {
	    document[imgName].src = eval(imgName + "off.src");
    }
}