try this code, it may help you solving your problem.
<script type = "text/javascript">
function displayImage(image) {
document.getElementById("img").src = image;
}
function displayNextImage() {
x = (x == images.length - 1) ? 0 : x + 1;
clearInterval(timer);
displayImage(images[x]);
timer = setInterval( displayThisImage, 5000 );
}
function displayThisImage( ) {
x = (x == images.length - 1) ? 0 : x + 1;
displayImage(images[x]);
}
function displayPreviousImage() {
x = (x <= 0) ? images.length - 1 : x - 1;
clearInterval(timer);
displayImage(images[x]);
timer = setInterval( displayThisImage, 5000 );
}
function startTimer() {
timer = setInterval( displayThisImage, 5000 );
}
var images = [], x = -1;
var timer ;
images[0] = "http://rastastation.com/images/carousel_anthonyb2.png";
images[1] = "http://rastastation.com/images/carousel_capleton2.png";
images[2] = "http://rastastation.com/images/carousel_sizzla2.png";
images[3] = "http://rastastation.com/images/carousel_earlsixteen.png";
images[4] = "http://rastastation.com/images/carousel_norrisreid.png";
images[5] = "http://rastastation.com/images/carousel_yamibolo2.png";
images[6] = "http://rastastation.com/images/carousel_fantanmojah2.png";
images[7] = "http://rastastation.com/images/carousel_natural_black2.png";
images[8] = "http://rastastation.com/images/carousel_admiraltibet.png";
images[9] = "http://rastastation.com/images/carousel_luciano.png";
</script>