var SlideShowSpeed = 3000;
var Picture = new Array(); ;
var el
var iSet = ""
var ArrPosition = 0;

Picture[0] = 'img/DeepWellPumping/Mine activity.JPG';
Picture[1] = 'img/DeepWellPumping/Water gathering in depressions.JPG';
Picture[2] = 'img/DeepWellPumping/well depressurization efforts.JPG';
Picture[3] = 'img/DeepWellPumping/well head.JPG';

function runSlideShow() {
    el = Math.round(Math.random() * (Picture.length - 1));
    document.images.PictureBox.src = Picture[el];
    ArrPosition = 0;
}

function ClearMyInerval() {
    clearInterval(iSet);
    document.getElementById("PlayPause").src = "img/PlayButton/Untitled-4.png";
}

function CreateMyInterval() {
    iSet = setInterval("runSlideShow();", 2000);
    document.getElementById("PlayPause").src = "img/PlayButton/Untitled-3.png";
}

function NextClick() {
    if ((ArrPosition < Picture.length) & (ArrPosition >= 0)) {
        document.images.PictureBox.src = Picture[ArrPosition];
        ArrPosition++;
    }
    else {
        document.images.PictureBox.src = Picture[0];
        ArrPosition = 1;
    }
}

function PreviousClick() {
    if ((ArrPosition < Picture.length) & (ArrPosition >= 0)) {
        document.images.PictureBox.src = Picture[ArrPosition];
        ArrPosition--;
    }
    else {
        document.images.PictureBox.src = Picture[Picture.length - 1];
        ArrPosition = Picture.length - 2;
    }
}