<tr>

                <td align="right" style="width: 100px">

                    请选择图片：

                    <br />

                    <input id="File1" type="file" name="File" runat="server" style="width: 245px" />描述：

                    <input name="text" type="text" style="width: 150px" maxlength="20" />

                </td>

                <td align="left" style="width: 500px">

                    <p id="MyFile">

                        <input onclick="addFile()" type="button" value="增加图片(Add)" />

                    </p>

                </td>

            </tr>

<script type="text/javascript">

        var i = 1;

        function addFile() {

            if (i < 8) {

                var str = '<BR> <input type="file" name="File" runat="server" style="width: 200px"/>描述：<input name="text" type="text" style="width: 150px" maxlength="20" /> <input type="button" onclick="deleteFile" value="X"/> ';

                document.getElementById('MyFile').insertAdjacentHTML("beforeEnd", str);

            }

            else {

                alert("您一次最多只能上传8张图片！");

            }

            i++;

        }

    </script>