function mailaddress()
{
    return 'repl1repl2ulrichschumacher.net'.replace(/repl1/, "contact").replace(/repl2/, "@");
}
function changeImage(imageName, imageSrc)
{
    if (document.images)
    {
        if (document.images[imageName])
        {
            document.images[imageName].src = imageSrc;
        }
    }
}