下载一下AJAXControlToolkit组件，引用一下，然后在IE浏览器的安全选项中把“活动脚本”设置为启用.这两项我都作了,依然如此.vs2010需要引用吗？您再说一下引用的方法吧？

全部试过,依然如此

dafault.aspx(动态)黄色提示字数如下:
<script type="text/javascript">
//<![CDATA[
Sys.Application.add_init(function() {
    $create(Sys.Extended.UI.SlideShowBehavior, 

{"autoPlay":true,"id":"SlideShowExtender1","imageDescriptionLabelID":"imageDescription","imageHeight":0,"imageWidth":0,"loop":true

,"nextButtonID":"nextButton","playButtonID":"playButton","playButtonText":"开","playInterval":2000,"previousButtonID":"prevButton"

,"slideShowServiceMethod":"GetSlides","slideShowServicePath":"/WebSite2/Default.aspx","stopButtonText":"停止"}, null, null, $get

("Image1"));
});
//]]>
</script>

对话框中的字
SlideShowExtender JavaScript 运行时错误: 无法获取未定义或 null 引用的属性“UI”