转：http://blog.csdn.net/lgm97/article/details/6409227
<!--
处理搜索按下“enter”键和点击后退按钮 -->
<input type="text" name="__spDummyText1" style="display:none;" size="1"/>
<input type="text" name="__spDummyText2" style="display:none;" size="1"/>
</form>
<!-- extra form for some instances -->
<asp:ContentPlaceHolder id="PlaceHolderUtilityContent" runat="server" />
<!--
提醒用户更新老版本的浏览器-->
<SharePoint:WarnOnUnsupportedBrowsers runat="server"/>