function klapp(wer)
{
if (document.getElementById(wer).style.display == "none")
{document.getElementById(wer).style.display = "block"}
else
{document.getElementById(wer).style.display = "none"}
}

function newImage(arg) {
        if (document.images) {
                rslt = new Image();
                rslt.src = arg;
                return rslt;
        }
}

function changeImages() {
        if (document.images && (preloadFlag == true)) {
                for (var i=0; i<changeImages.arguments.length; i+=2) {
                        document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
                }
        }
}

var preloadFlag = false;
function preloadImages() {
        if (document.images) {
                head_01_head_03_over = newImage("Bilder/head_01-head_03_over.jpg");
                head_02_head_03_over = newImage("Bilder/head_02-head_03_over.jpg");
                head_03_over = newImage("Bilder/head_03-over.gif");
                head_04_head_03_over = newImage("Bilder/head_04-head_03_over.jpg");
                head_05_head_03_over = newImage("Bilder/head_05-head_03_over.jpg");
                head_08_head_03_over = newImage("Bilder/head_08-head_03_over.jpg");
                preloadFlag = true;
        }
}