function slider() {
    $("#gallery").trigger('click'); // where #mygalone is the id of your images main div container
}

function play(){
slideOn = setInterval("slider()",5000); // change every 3 seconds.
document.getElementById('play').style.visibility="hidden";
document.getElementById('pause').style.visibility="visible";
}

function pause(){
clearInterval(slideOn); // stop it.
document.getElementById('pause').style.visibility="hidden";
document.getElementById('play').style.visibility="visible";
}