var selectedImage = null;
    function mouseoverImage(image) {
        if (image.src.indexOf("-over") == -1) {
            firstPart = image.src.substring(0,image.src.length-4); 
            lastPart = image.src.substring(image.src.length-4); 
            image.src = firstPart + "-over" + lastPart;
        }
    }

    function clickImage(image) {
        selectedImage = image;
        deselectImages();
    }

    function mouseoutImage(image) {
        if (image != selectedImage) {
            firstPart = image.src.substring(0,image.src.length-9); 
            lastPart = image.src.substring(image.src.length-4); 
            image.src = firstPart + lastPart;
        }
    }

    function deselectImages() {
        var bodyId = document.body.id;
        var images = new Array();
        images = document.getElementsByTagName('img');

        for (var i = 0; i < images.length; i++) {
            if ((images[i].src.indexOf("-over") >0) && (images[i] != selectedImage)) {
                mouseoutImage(images[i]);
            }
        }
    }