ghost_addEvent(window, 'load', function() {
    var image, imageContainer, imageNode,
        lis = document.getElementById('prodnav').getElementsByTagName('li');
    for (var i = 0; i < lis.length; i++) {
        if (image = lis[i].getAttribute('image')) {
            //console.log(image);
            if (imageContainer = getElementsByClass('topimage', lis[i].parentNode, 'li')[0]) {
                //console.log(imageContainer, image);
                imageNode = imageContainer.getElementsByTagName('img')[0];
                ghost_addEvent(lis[i], 'mouseover', function(image, imageNode) {
                    return function() {
                        imageNode.src = imageNode.src.replace(/img=[^&]+/, 'img=' + image);
                    };
                }(image, imageNode));
            }
        }
    }
});