NewImg1 = new Array (
"images/a1.jpg",
"images/a2.jpg",
"images/a3.jpg",
"images/a4.jpg",
"images/a5.jpg",
"images/a6.jpg",
"images/a7.jpg"
);
var ImgNum1 = 0;
var ImgLength1 = NewImg1.length - 1;

var delay = 3000;

var lock1 = false;
var run1;
function chgImg1(direction) {
if (document.images) {
ImgNum1 = ImgNum1 + direction;
if (ImgNum1 > ImgLength1) {
ImgNum1 = 0;
}
if (ImgNum1 < 0) {
ImgNum1 = ImgLength1;
}
document.slideshow1.src = NewImg1[ImgNum1];
   }
}
run = setInterval("chgImg1(1)", delay);