function foo() {
    alert('foo');
}

var dimages = new Array();
var numImages = 16;
for (i = 0; i < numImages; i++) {
    dimages[i] = new Image();
    if (i < 9)
        dimages[i].src = "Bilder/start_mitte_0" + (i + 1) + ".jpg";
    else
        dimages[i].src = "Bilder/start_mitte_" + (i + 1) + ".jpg";
}
var curImage = Math.round(numImages * Math.random())+1;

function swapPicture() {
    if (document.images) {
        var nextImage = curImage + 1;
        if (nextImage >= numImages)
            nextImage = 0;
        if (dimages[nextImage] && dimages[nextImage].complete) {
            var target = 0;
            if (document.images.myImage)
                target = document.images.myImage;
            if (document.all && document.getElementById("myImage"))
                target = document.getElementById("myImage");

            // make sure target is valid.  It might not be valid
            //   if the page has not finished loading
            if (target) {
                target.src = dimages[nextImage].src;
                curImage = nextImage;
            }

            setTimeout("swapPicture()", 5000);

        }
        else {
            setTimeout("swapPicture()", 2500);
        }
    }
}

setTimeout("swapPicture()", 5000);