Ajax无刷新实现图片切换特效

nsition=23)">
            </div>
            <div id="Layer2" style="Z-INDEX:2; LEFT:490px; WIDTH:112px; POSITION:absolute; TOP:380px; HEIGHT:26px">
                <img id="btnPlay" src="/UploadFile/200804/13/21104423436.gif" onclick="slideshow_automatic()" onmouseover="this.src=''/UploadFile/200804/13/F3104423624.gif''"
                    onmouseout="this.src=''/UploadFile/200804/13/21104423436.gif''"> <img id="btnPause" src="/UploadFile/200804/13/FE104423914.gif" onclick="pauseSlideShow()" onmouseover="this.src=''/UploadFile/200804/13/D0104424833.gif''"
                    onmouseout="this.src=''/UploadFile/200804/13/FE104423914.gif''"> <img id="btnPrev" src="/UploadFile/200804/13/ED104424431.gif" onclick="previous_image()" onmouseover="this.src=''/UploadFile/200804/13/40104424257.gif''"
                    onmouseout="this.src=''/UploadFile/200804/13/ED104424431.gif''"> <img id="btnNext" src="/UploadFile/200804/13/DC104424135.gif" onclick="next_image()" onmouseover="this.src=''/UploadFile/200804/13/5D104424663.gif'';next_image()"
                    onmouseout="this.src=''/UploadFile/200804/13/DC104424135.gif''">
            </div>
三、JAVASCRIPT:
<script language="javascript" type="text/javascript">
            // 定时器
            var timeDelay;
           
            // 图片自动浏览时的时间间隔
            var timeInterval = 4000;
           
            // Array对象,存储图片文件的路径
            var image;
           
            // 当前显示的图片序号
            var num;
           
            // 图片信息数据表
            var dt;
 &nb