如何用Javascript 获取tabcontainer中的值
我用Ajax里的tabcontainer控件做了一个tab,但是我不知道怎么用javascript获得里面的控件的值,各位帮忙! 
  <%@   Page   Language= "C# "   AutoEventWireup= "true "   CodeFile= "Default2.aspx.cs "   Inherits= "Default2 "   %>    
  <%@   Register   Assembly= "System.Web.Extensions,   Version=1.0.61025.0,   Culture=neutral,   PublicKeyToken=31bf3856ad364e35 " 
             Namespace= "System.Web.UI "   TagPrefix= "asp "   %>  
  <%@   Register   Assembly= "AjaxControlToolkit "   Namespace= "AjaxControlToolkit "   TagPrefix= "cc1 "   %>    
  <!DOCTYPE   html   PUBLIC    "-//W3C//DTD   XHTML   1.0   Transitional//EN "    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">    
  <html   xmlns= "http://www.w3.org/1999/xhtml "   >  
  <head   runat= "server ">  
              <title> Untitled   Page </title>  
  <script   language= "javascript "   type= "text/javascript ">  
  <!--   
 function   Radio1_onclick()   { 
 //此处不知道如何写,我想获取textbox1的值,并给textbox2赋值 
 }   
 //   -->  
  </script>  
  </head>  
  <body>  
              <form   id= "form1 "   runat= "server ">  
              <div>  
                          <asp:ScriptManager   ID= "ScriptManager1 "   runat= "server ">  
                          </asp:ScriptManager>  
                          <cc1:TabContainer   ID= "TabContainer1 "   runat= "server "   ActiveTabIndex= "0 "   Width= "473px ">  
                                      <cc1:TabPanel   ID= "TabPanel1 "   runat= "server "   HeaderText= "TabPanel1 ">  
                                                  <ContentTemplate>  
                                                              <asp:UpdatePanel   ID= "UpdatePanel1 "   runat= "server ">  
                                                                          <ContentTemplate>  
                                                                                      <table   style= "width:   465px ">  
                                                                                                  <tr>