NewImg = new Array (
"img/1.jpg",
"img/2.jpg",
"img/3.jpg",
"img/4.jpg",
"img/5.jpg",
"img/6.jpg",
"img/7.jpg",
"img/8.jpg",
"img/9.jpg",
"img/10.jpg",
"img/11.jpg",
"img/12.jpg"
);
var ImgNum = 0;
var ImgLength = NewImg.length - 1;

//Time delay between Slides in milliseconds
var delay = 1000;

var lock = false;
var run;
function chgImg(direction) {
if (document.images) {
ImgNum = ImgNum + direction;
if (ImgNum > ImgLength) {
ImgNum = 0;
}
if (ImgNum < 0) {
ImgNum = ImgLength;
}
document.slideshow.src = NewImg[ImgNum];
   }
}
function auto() {
if (lock == true) {
lock = false;
window.clearInterval(run);
}
else if (lock == false) {
lock = true;
run = setInterval("chgImg(1)", delay);
   }
}