// Detect if browser is Netscape 3 + or IE 4 +.
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") { 
	homebtn_over = new Image();
	homebtn_over.src = "images/menu-home-over.jpg";
	cmr42btn_over = new Image();
	cmr42btn_over.src = "images/menu-cmr42-over.jpg";
	companybtn_over = new Image();
	companybtn_over.src = "images/menu-company-over.jpg";
	contactbtn_over = new Image();
	contactbtn_over.src = "images/menu-contact-over.jpg";
	loginbtn_over = new Image();
	loginbtn_over.src = "images/menu-login-over.jpg";

	homebtn_off = new Image();
	homebtn_off.src = "images/menu-home-off.jpg";
	cmr42btn_off = new Image();
	cmr42btn_off.src = "images/menu-cmr42-off.jpg";
	companybtn_off = new Image();
	companybtn_off.src = "images/menu-company-off.jpg";
	contactbtn_off = new Image();
	contactbtn_off.src = "images/menu-contact-off.jpg";
	loginbtn_off = new Image();
	loginbtn_off.src = "images/menu-login-off.jpg";
}

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

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