<script type="text/javascript">

        var i = 1; var n;

        function showImg() {

            if (document.getElementById('img').getAttribute("src") == "images/1.jpg") {

                document.getElementById('img').setAttribute("src","images/2.jpg");

            }

            else {

                 document.getElementById('img').setAttribute("src","images/1.jpg");

            }

        }

        function showImg1() {

            document.getElementById('img').setAttribute("src", "images/" + i + ".jpg"); i++;

            if (i > 10)

            {

                i = 1;

            }

        }

        function show() {

          n=setInterval(showImg1, 500);

        }

        function show1() {

            clearInterval(n);

        }

    </script>

</head>

<body>

    <img id="img" alt="" src="images/1.jpg" width="200" height="200" />

    <input id="Button1" type="button" value="换图片" onclick="showImg()" />

    <input id="Button2" type="button" value="切图" onclick="showImg1()" />

    <input id="Button3" type="button" value="轮换" onclick="show()" />

        <input id="Button4" type="button" value="停止轮换" onclick="show1()" />

</body>

</html>