Press left and right arrow to change image?

Answer 1

You can detect arrow key presses in JavaScript and then attach each key to an event. This SO answer shows how it's done but essentially:

document.onkeydown = checkKey;

function checkKey(e) {

    e = e || window.event;

    if (e.keyCode == '37') {
        // left arrow
    }
    else if (e.keyCode == '39') {
        // right arrow
    }
}