function turnOn(imageName)
{
    if (document.images)
    {
        document[imageName].src = eval(imageName + "on.src");
    }
}

function turnOff(imageName)
{
    if (document.images)
    {
        document[imageName].src = eval(imageName + "off.src");
    }
}

if (document.images)
{
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    Navfeatureson.src = "/images/nav/features-S.png";
    Navfeaturesoff = new Image();
    Navfeaturesoff.src = "/images/nav/features.png";

    Navsignupon = new Image();
    Navsignupon.src = "/images/nav/signup-S.png";
    Navsignupoff = new Image();
    Navsignupoff.src = "/images/nav/signup.png";

    Navdownloadon = new Image();
    Navdownloadon.src = "/images/nav/download-S.png";
    Navdownloadoff = new Image();
    Navdownloadoff.src = "/images/nav/download.png";

    Navsupporton = new Image();
    Navsupporton.src = "/images/nav/support-S.png";
    Navsupportoff = new Image();
    Navsupportoff.src = "/images/nav/support.png";

    Navdocson = new Image();
    Navdocson.src = "/images/nav/docs-S.png";
    Navdocsoff = new Image();
    Navdocsoff.src = "/images/nav/docs.png";

    Navforumson = new Image();
    Navforumson.src = "/images/nav/forums-S.png";
    Navforumsoff = new Image();
    Navforumsoff.src = "/images/nav/forums.png";

    Navwebserviceson = new Image();
    Navwebserviceson.src = "/images/nav/webservices-S.png";
    Navwebservicesoff = new Image();
    Navwebservicesoff.src = "/images/nav/webservices.png";
    
    Navlogoffon = new Image();
    Navlogoffon.src = "/images/nav/logoff-S.png";
    Navlogoffoff = new Image();
    Navlogoffoff.src = "/images/nav/logoff.png";
}