刷新浏览器时,iframe不会变成默认页面,而是当前页面

<ul class="kidc"> <li><a target="Conframe" href="../../AdminHtml/Template/manage.php">管理1</a></li> <li><a target="Conframe" href="../../AdminHtml/Template/article.manage.php">管理2</a></li> <li><a target="Conframe" href="../../AdminHtml/Template/book.manage.php">管理3</a></li> <li><a target="Conframe" href="../../AdminHtml/Template/test.manage.php">管理4</a></li></ul><div class="Conframe"> <iframe name="Conframe" id="Conframe" scrolling="no" frameborder="0" width="100%" onload="this.height=Conframe.document.body.scrollHeight+20" src="" ></iframe> </div>请问怎么设置默认页面，还有下面这个怎么用每个需要记住的页面加上 Session.Add("focusUrl", this.Request.Url.ToString());主页上<iframe id="ifrUrl" src="" ranat="server" />主页CS:if(Session["focusUrl"] != null){this.ifrUrl.Attributes["src"] = Session["focusUrl"].ToString();}