var browser = navigator.appName.substring(0,8);
        var version = parseInt(navigator.appVersion); 
        var supported = ((browser == "Netscape") && (version >= 3)) ||
                    ((browser == "Microsof") && (version >= 4));

	if (supported)
{
    wire = new Image(276, 22);
    wire.src = "images/wire.gif";
    wireOn = new Image(276, 22);
    wireOn.src = "images/wire_over.gif";
    die = new Image(276, 22);
    die.src = "images/die.gif";
    dieOn = new Image(276, 22);
    dieOn.src = "images/die_over.gif";
    punch = new Image(276, 22);
    punch.src = "images/punch.gif";
    punchOn = new Image(276, 22);
    punchOn.src = "images/punch_over.gif";
    proto = new Image(276, 22);
    proto.src = "images/proto.gif";
    protoOn = new Image(276, 22);
    protoOn.src = "images/proto_over.gif";
    involute = new Image(276, 22);
    involute.src = "images/involute.gif";
    involuteOn = new Image(276, 22);
    involuteOn.src = "images/involute_over.gif";
    finished = new Image(276, 22);
    finished.src = "images/finished.gif";
    finishedOn = new Image(276, 22);
    finishedOn.src = "images/finished_over.gif";
    gauges = new Image(276, 22);
    gauges.src = "images/gauges.gif";
    gaugesOn = new Image(276, 22);
    gaugesOn.src = "images/gauges_over.gif";
    mould = new Image(276, 22);
    mould.src = "images/mould.gif";
    mouldOn = new Image(276, 22);
    mouldOn.src = "images/mould_over.gif";
    contact = new Image(276, 22);
    contact.src = "images/contact.gif";
    contactOn = new Image(276, 22);
    contactOn.src = "images/contact_over.gif";
    profile = new Image(276, 22);
    profile.src = "images/profile.gif";
    profileOn = new Image(166, 22);
    profileOn.src = "images/profile_over.gif";
	machine = new Image(276, 22);
    machine.src = "images/machine.gif";
    machineOn = new Image(276, 22);
    machineOn.src = "images/machine_over.gif";
    window.onerror = null;
}

function overImg(imgName)
{
	if (supported)
    {
        imgOn = eval(imgName + "On.src");
        document [imgName].src = imgOn;
    }
}

function offImg(imgName)
{
	if (supported)
    {
        imgOff = eval(imgName + ".src");
        document [imgName].src = imgOff;
    }
}