Timer Summary.

JavaScript

• setInterval  (<function>,  5000);   // unit is milliseconds
• setTimeout (<function>,  5000);
• clearInterval (handler);
• clearTimeout (handler);

Example

var myImage = document.getelementById("mainImage");
var imageArray = ["_images/overlook.jpg", "_images/tree.pg",...]
var imageIndex = 0;

function changeImage() {
    myImage.setAttribute ("src", imageArray[imageIndex]);
    imageIndex++;
    if (imageIndex >= imageArray.length) {
        imageIndex = 0;
    }
}

var intervalHandle = setInterval (changeImage, 5000);
myImage.onclick = function() {
    clearInterval (intervalHandler);
}

Java