var Picture = new Array(); 
Picture[1]  = 'img/1.jpg';
Picture[2]  = 'img/2.jpg';
Picture[3]  = 'img/3.jpg';
Picture[4]  = 'img/4.jpg';
Picture[5]  = 'img/5.jpg';
Picture[6]  = 'img/6.jpg';
Picture[7]  = 'img/7.jpg';
Picture[8]  = 'img/8.jpg';
Picture[9]  = 'img/9.jpg';

var startPic = 3;

var preLoad = new Array();
for (currentPic = 3; currentPic < 10; currentPic++){
preLoad[currentPic] = new Image();
preLoad[currentPic].src = Picture[currentPic];
}

function slideShow(){

document.images.PictureBox.src = preLoad[startPic].src;

startPic = startPic + 1;
if (startPic > 9) startPic=3;
setTimeout('slideShow()', 5000);
}