browserName = navigator.appName;
    browserVer = parseInt(navigator.appVersion);
    if ((browserName == "Netscape" && browserVer >= 3) || (browserName == "Microsoft Internet Explorer" && browserVer >=4)) {
        browserOK = "yes";
    } else {
        browserOK = "no";
    }
    


    if (browserOK == "yes") {
        button1On = new Image(100, 40);
        button1On.src = "http://www.centerforeducationadvocacy.com/images/button_on_membership.gif";
        button1Off = new Image(100, 40);
        button1Off.src = "http://www.centerforeducationadvocacy.com/images/button_off_membership.gif";

        button2On = new Image(100, 40);
        button2On.src = "http://www.centerforeducationadvocacy.com/images/button_on_members.gif";
        button2Off = new Image(100, 40);
        button2Off.src = "http://www.centerforeducationadvocacy.com/images/button_off_members.gif";

        button3On = new Image(100, 40);
        button3On.src = "http://www.centerforeducationadvocacy.com/images/button_on_contact.gif";
        button3Off = new Image(100, 40);
        button3Off.src = "http://www.centerforeducationadvocacy.com/images/button_off_contact.gif";

        button4On = new Image(100, 40);
        button4On.src = "http://www.centerforeducationadvocacy.com/images/button_on_links.gif";
        button4Off = new Image(100, 40);
        button4Off.src = "http://www.centerforeducationadvocacy.com/images/button_off_links.gif";

        button5On = new Image(100, 40);
        button5On.src = "http://www.centerforeducationadvocacy.com/images/button_on_services.gif";
        button5Off = new Image(100, 40);
        button5Off.src = "http://www.centerforeducationadvocacy.com/images/button_off_services.gif";

        button6On = new Image(100, 40);
        button6On.src = "http://www.centerforeducationadvocacy.com/images/button_on_home.gif";
        button6Off = new Image(100, 40);
        button6Off.src = "http://www.centerforeducationadvocacy.com/images/button_off_home.gif";
    }

    function imageOn(imgName) {
        if (browserOK == "yes") 
        {
            imgOn = eval(imgName + "On.src");
            document [imgName].src = imgOn;
        }
    }

    function imageOff(imgName) {
        if (browserOK == "yes") 
        {
            imgOff = eval(imgName + "Off.src");
            document [imgName].src = imgOff;
        }
    }