nMaxItem = 4;
NameIndex = 0;
DefaultState = 1;

MouseOverState = 2;
MouseDownState = 3;
imgCounter = 0;

ImageList = new Array();

bIsSupportOK = (
        ((navigator.appName == "Netscape") && (parseInt(navigator.appVersion) >= 3 )) ||
        ((navigator.appName == "Microsoft Internet Explorer") && (parseInt(navigator.appVersion) >= 4 ))
);

function AddImageToImageList(name, Default, MouseOver, MouseDown)
{
        ImageList[imgCounter] = new Array(nMaxItem);
        ImageList[imgCounter][NameIndex] = name;
        ImageList[imgCounter][DefaultState] = new Image();
        ImageList[imgCounter][DefaultState].src = Default;
        if (MouseOver != "") {
                ImageList[imgCounter][MouseOverState] = new Image();
                ImageList[imgCounter][MouseOverState].src = MouseOver;
        }
        if (MouseDown != "") {
                ImageList[imgCounter][MouseDownState] = new Image();
                ImageList[imgCounter][MouseDownState].src = MouseDown;
        }

        imgCounter++;
}

function ReplaceImage(name, state)
{
        for (i = 0; i < imgCounter; i++) {
                if (document.images[ImageList[i][NameIndex]] != null) {
                        if ((name == ImageList[i][NameIndex]) && (ImageList[i][state] != null))
                                document.images[name].src = ImageList[i][state].src;
                }
        }
}

AddImageToImageList("home", "images/nav/bt1a.jpg", "images/nav/bt1b.jpg", "images/nav/bt1c.jpg");
AddImageToImageList("konz", "images/nav/bt2a.jpg", "images/nav/bt2b.jpg", "images/nav/bt2c.jpg");
AddImageToImageList("progr", "images/nav/bt3a.jpg", "images/nav/bt3b.jpg", "images/nav/bt3c.jpg");
AddImageToImageList("cd", "images/nav/bt4a.jpg", "images/nav/bt4b.jpg", "images/nav/bt4c.jpg");
AddImageToImageList("musik", "images/nav/bt5a.jpg", "images/nav/bt5b.jpg", "images/nav/bt5c.jpg");
AddImageToImageList("refer", "images/nav/bt6a.jpg", "images/nav/bt6b.jpg", "images/nav/bt6c.jpg");
AddImageToImageList("impr", "images/nav/bt7a.jpg", "images/nav/bt7b.jpg", "images/nav/bt7c.jpg");
AddImageToImageList("at", "images/ata.jpg", "images/atb.jpg", "images/atc.jpg");
AddImageToImageList("kont", "images/nav/bt8a.jpg", "images/nav/bt8b.jpg", "images/nav/bt8c.jpg");
AddImageToImageList("bild", "images/nav/bt9a.jpg", "images/nav/bt9b.jpg", "images/nav/bt9c.jpg");
AddImageToImageList("gast", "images/nav/bt10a.jpg", "images/nav/bt10b.jpg", "images/nav/bt10c.jpg");
AddImageToImageList("proj", "images/nav/bt11a.jpg", "images/nav/bt11b.jpg", "images/nav/bt11c.jpg");