Js全反选DataGrid

 // **************************************************************** //
 // function Trim(value)
 // --------------
 // 功能：删除两端空格（= Trim）
 // 参数：       value 要格式化的字符串
 // 返回：       格式化后的字符串
 // **************************************************************** //
 function Trim(value){
  var res = String(value).replace(/^[\s]+|[\s]+$/g,'');
  return res;
 }
 //弹出帮助窗口
 function PopWindow(tablename,filter)
 {

  var value = window.showModalDialog("../PubHelp/PopWindow.aspx?tablename="+tablename+"&filter="+filter,'','dialogWidth:350px;dialogHeight:345px;center:yes;status:no;help:no');
  return value;
 }
 //弹出帮助窗口
 function SignPopWindow(tablename,filter)
 {

  var value = window.showModalDialog("../../../PubHelp/PopWindow.aspx?tablename="+tablename+"&filter="+filter,'','dialogWidth:350px;dialogHeight:345px;center:yes;status:no;help:no');
  return value;
 }

 function NewPopWindow(tablename,filter){
     var value = window.showModalDialog("../../PubHelp/PopWindow.aspx?tablename="+tablename+"&filter="+filter,'','dialogWidth:350px;dialogHeight:345px;center:yes;status:no;help:no');
  return value;
 }

 function PopTeacherWindow(filter)
 {
  var value = window.showModalDialog("../TeachManage/QueryTeacher.aspx?filter="+filter,'','dialogWidth:500px;dialogHeight:345px;center:yes;status:no;help:no');
  return value;
 }

 function PopDateWindow(date){
     var value = window.showModalDialog("../PubHelp/PubDate.aspx?date="+date,'','dialogWidth:250px;dialogHeight:245px;center:yes;status:no;help:no');
     return value;
 }
 function PopDateWindowView(date){
     var value = window.showModalDialog("../PubHelp/PubDateView.aspx?date="+date,'','dialogWidth:280px;dialogHeight:245px;center:yes;status:no;help:no');
     return value;
 }
 function PopUserWindow(filter)
 {

  var value = window.showModalDialog("AppAuditMan.aspx?filter="+filter,'','dialogWidth:550px;dialogHeight:400px;center:yes;status:no;help:no');
  return value;
 }

 ///DataGrid多选脚本函数
 function Check(){
     if (document.all("Grid")==null) return;
  var count = document.all("Grid").rows.length;
  count = count+1;
  var item;
  for(var i = 2;i<count;i++){
   //注释说明，下面这个是2.0下的处理方式，1.1下会出问题。
   if (i<10)
    item = "0"+eval(i);
   else
    item = i;
   if (document.all("Grid_ctl"+item+"_cb") == null)
       continue;
   document.all("Grid_ctl"+item+"_cb").status = true;

   //下面这个是1.1下的处理方式，2.0下又会出问题。
   //document.all("Grid__ctl"+i+"_cb").status = true;
  }
 }
 //DataGrid取消多选脚本函数
 function UnCheck(){
 //alert("123");
     if (document.all("Grid")==null) return;
  var count = document.all("Grid").rows.length;
  count = count+1;
  var item;
  for(var i = 2;i<count;i++){
   //注释说明，下面这个是2.0下的处理方式，1.1下会出问题。
   if (i<10)
    item = "0"+eval(i);
   else
    item = i;
   if (document.all("Grid_ctl"+item+"_cb") == null)
       continue;
   document.all("Grid_ctl"+item+"_cb").status = false;

   //下面这个是1.1下的处理方式，2.0下又会出问题。
   //document.all("Grid__ctl"+i+"_cb").status = false;
  }
 }

 function UseInfo()
   {
       var src=event.srcElement;
       var org = document.form1.item("txtHiddenOrg").value;
       switch(src.id)
       {
        case "btnOrg":
         var returnvalue = PopWindow("tbOrg","Path like '"+org+"%'");
            if (returnvalue != undefined)
         {
          document.form1.item("txtOrgPath").value=returnvalue;
          return true;
         }
         break;

       }
       return false;
   }

       <a href="javascript:Check();" >全选</a>
       <a href="javascript:UnCheck();" >反选</a>&nbsp;
       姓名：

       <asp:TextBox id="txtSearch" runat="server" Width="40px"></asp:TextBox>
       校区：

       <asp:TextBox ID="txtOrg" runat="server" Width="90px"></asp:TextBox>
       <asp:Button ID="btnOrg" runat="server" OnClick="btnOrg_Click" OnClientClick="return UseInfo();" Text="选" />

 <asp:GridView ID="Grid" runat="server" AllowPaging="True" AutoGenerateColumns="False" OnPageIndexChanging="Grid_PageIndexChanging" Width="100%" OnRowDataBound="Grid_RowDataBound" PageSize="">
                          <Columns>

                              <asp:TemplateField>
                                  <ItemTemplate>
                                      <asp:CheckBox ID="cb" runat="server" />
                                  </ItemTemplate>
                              </asp:TemplateField>
                              <asp:BoundField DataField="ID" HeaderText="编号" />
                              <asp:BoundField DataField="OrgName" HeaderText="校区" />
                              <asp:BoundField DataField="TeacherName" HeaderText="姓名" />
                              <asp:BoundField DataField="TeacherTypeName" HeaderText="类别" />
                              <asp:BoundField DataField="CertName" HeaderText="学历" />
                              <asp:BoundField DataField="GraduatedFrom" HeaderText="毕业院校" />
                             <asp:BoundField DataField="BirthDay" HeaderText="出生日期" DataFormatString="{0:yyyy-MM-dd}"/>
                              <asp:BoundField DataField="SubjectName" HeaderText="科目" />
                              <asp:BoundField DataField="GradeName" HeaderText="年级" />
                              <asp:BoundField DataField="StartWorkTime" HeaderText="入职日期" DataFormatString="{0:yyyy-MM-dd}"/>
                              <asp:BoundField DataField="StudentCount" HeaderText="所带学生数" />
                              <asp:TemplateField>
                                  <ItemTemplate>
                                      <asp:LinkButton ID="link" runat="server">修改</asp:LinkButton>
                                  </ItemTemplate>
                              </asp:TemplateField>
                          </Columns>
                      </asp:GridView>

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