var loaded = 0;
function loadImg() {



        image1On = new Image(20,23);
        image1On.src = "../bilder/haus.gif";
        image1Off = new Image(20,23);
        image1Off.src = "../bilder/tanne.gif";

        image2On = new Image(20,23);
        image2On.src = "../bilder/haus.gif";
        image2Off = new Image(20,23);
        image2Off.src = "../bilder/tanne.gif";

            image3On = new Image(20,23);
        image3On.src = "../bilder/haus.gif";
        image3Off = new Image(20,23);
        image3Off.src = "../bilder/tanne.gif";

            image4On = new Image(20,23);
        image4On.src = "../bilder/haus.gif";
        image4Off = new Image(20,23);
        image4Off.src = "../bilder/tanne.gif";

           image5On = new Image(20,23);
        image5On.src = "../bilder/haus.gif";
        image5Off = new Image(20,23);
        image5Off.src = "../bilder/tanne.gif";

        image6On = new Image(20,23);
        image6On.src = "../bilder/haus.gif";
        image6Off = new Image(20,23);
        image6Off.src = "../bilder/tanne.gif";

        image7On = new Image(20,23);
        image7On.src = "../bilder/haus.gif";
        image7Off = new Image(20,23);
        image7Off.src = "../bilder/tanne.gif";

        image8On = new Image(20,23);
        image8On.src = "../bilder/haus.gif";
        image8Off = new Image(20,23);
        image8Off.src = "../bilder/tanne.gif";

        image9On = new Image(20,23);
        image9On.src = "../bilder/haus.gif";
        image9Off = new Image(20,23);
        image9Off.src = "../bilder/tanne.gif";
        
                loaded = 1;
}

function switchOn(imgName) {
        if (loaded == 1) {
        imgOn = eval(imgName + "On.src");
        document [imgName].src = imgOn;
        }
}
function switchOff(imgName) {
        if (loaded == 1) {
        imgOff = eval(imgName + "Off.src");
        document [imgName].src = imgOff;
        }
}