function chgImg(direction) {
if (document.images) {
ImgNum = ImgNum + direction;
//ImgUrl = ImgUrl + direction;
if (ImgNum > ImgLength){
ImgNum = 0;
//ImgUrl = 0;
}
if (ImgNum < 0) {
ImgNum = ImgLength;
//ImgUrl = UrlLength;
}
document.slideshow.src = NewImg[ImgNum];
//url = NewUrl[ImgUrl];
   }
}


function auto() {
if (lock == true) {
lock = false;
window.clearInterval(run);
}
else if (lock == false) {
lock = true;
run = setInterval("chgImg(1)", delay);
   }
}