NewImg = new Array (
"bilder/sample_galerie_1.jpg",
"bilder/sample_galerie_2.jpg",
"bilder/sample_galerie_3.jpg"
);

var ImgNum = 0;
var ImgLength = NewImg.length - 1;

var zeit = 3000;

var start;
function chgImg(direction) {
if (document.images) {
ImgNum = ImgNum + direction;
if (ImgNum > ImgLength) {
ImgNum = 0;
}
if (ImgNum < 0) {
ImgNum = ImgLength;
}
document.bilderwechsel.src = NewImg[ImgNum];
   }
}
function auto() {
start = setInterval("chgImg(1)", zeit);
}