[ruslan_mart]

$(function () {

    image1 = new Image();
    image1.src = "img/1.png";
    
    image2 = new Image();
    image2.src = "img/2.png";
    
    image3 = new Image();
    image3.src = "img/3.png";

    $("#tap").click(function () {
        setInterval(slideit, 20);
    });
});

var step = 1;

function slideit() {
if(step > 2) step = 1;
if (step < 3){
   document.images.slide.src = window['image' + step].src;
   step++; }
}

Можно так попробовать