<img src="one.jpg" id="imageid" onclick="img_clicked()">
<script>
    var clicks = 1;
    function img_clicked() {
        clicks ++;
        switch(clicks) {
            case 1: document.getElementById("imageid").src="one.jpg"; break;
            case 2: document.getElementById("imageid").src="two.jpg"; break;
            case 3: document.getElementById("imageid").src="three.jpg"; clicks = 0; break;
        }
    }
</script>
</script>