Javascript & asp.net : transfer info from textbox to label

Hello experts,

I'm trying to transfer text from a textbox to a label with javascript.  There's 1 page that uses 2 ajax modal popup extenders.  Trying to transfer data from one to the other.  One is for entering meeting notes, the other is used to preview them.  

So basically I want elm1 text to go into  MeetingInfoRvw with Javascript.

Here's the aspx page:

<asp:LinkButton ID="AddNewLinkBtn" runat="server" class="textBold" CausesValidation="false" CommandName="AddNewLinkBtn_Click" >Add New</asp:LinkButton>

<script language="JavaScript" type="text/javascript">
 function transferData() {
      alert("here");
      document.getElementById('MeetingInfoRvw').innerHTML = "here's the text";
    }
</script>
<%--~~~~~~~~~~~~        Add New Meeting Info  Area  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~--%>
<ajaxToolkit:ModalPopupExtender ID="mpe1" runat="server"
            BehaviorID="mpe1"
            TargetControlID="AddNewLinkBtn"
            PopupControlID="divPopUPAdd"
            BackgroundCssClass="modalBackgroundClass" DropShadow="false">
</ajaxToolkit:ModalPopupExtender>
<div id="divPopUPAdd" class="contents" style="width:900px;height:550px;border:solid1px#dddddd;
            top:50px; position:relative; left: 50px;" runat="server" align="center">
<div id="Layer2" style="position:absolute; left:685px; top:83px; width:97px; height:17px; z-index:5">
    <span class="text"><font color="#990000">*Required field </font></span></div>            
<table cellpadding="0" cellspacing="0" style="width: 843 px;" border="0">
<tr>
      <td>&nbsp;</td>
      <td class="textBold" style="width: 174px" align="left">Meeting Date<font color="#990000">*</font>:</td>
      <td class="style1" align="left"><asp:TextBox ID="MeetingDatetxt" runat="server" style="margin-bottom: 0px" Width="78px"></asp:TextBox>
        <ajaxToolkit:CalendarExtender ID="CalendarExtender2" runat="server" TargetControlID="MeetingDatetxt" PopupButtonID="CalendarBtn" >
         </ajaxToolkit:CalendarExtender>
</td>
<td style="width: 524px;" align="left"><asp:ImageButton ID="CalendarBtn" runat="server"  ImageUrl="~/Tools/Images/Calendar2.gif" CausesValidation="false"/> <asp:RequiredFieldValidator ID="AddDateVld" runat="server" ErrorMessage="Please enter a date" ControlToValidate="MeetingDatetxt" Display="Dynamic" CssClass="textBold" SetFocusOnError="True"></asp:RequiredFieldValidator>
                    <asp:HiddenField ID="hdnID" runat="server" />
                </td>
      <td>&nbsp;</td>
</tr>
<tr>
      <td>&nbsp;</td>
      <td  class="textBold" align="left">Meeting Notes Text<font color="#990000">*</font>:</td>
      <td colspan="2" valign="top"> </td>
      <td>&nbsp;</td>
</tr>
<tr>
      <td> &nbsp;</td>
      <td colspan="3" align="left"><asp:RequiredFieldValidator ID="MeetingNotesvld" runat="server" ErrorMessage="Please enter Meeting Information"
                            ControlToValidate="elm1" Display="Dynamic"></asp:RequiredFieldValidator>
      
      <asp:TextBox ID="elm1" runat="server" TextMode="MultiLine" ClientIDMode="Static"  Width="766px" Height="200px" />
     </td>
      <td> &nbsp;</td>
</tr>
<tr>
      <td>&nbsp;</td>
      <td colspan="3" align="right">
      <asp:Button ID="PreviewNotesBtn" runat="server" Text="Preview Notes" CausesValidation="False" onClientClick="transferData();" />
      <asp:Button ID="btnHide" runat="server" Text="Cancel" OnClick="btnHide_Click" CausesValidation="False" />
      <asp:Button ID="SubmitAddBtn" runat="server" Text="Submit"  CausesValidation="True"  />
                <asp:Button ID="SubmitEditBtn" runat="server" Text="Submit" />
      </td>
      <td>&nbsp;</td>
</tr>
</table>
 </div>
 <%'~~~~~~~~~~~     END  Add New Meeting Info  Area  ~~~~~~~~~~~~~~~~~--%>
      
<%'~~~~~~~~~~~~~   REVIEW PANEL     ~~~~~~~~~~~~~~~~~~~~~~~~~~~ %>
     <ajaxToolkit:ModalPopupExtender ID="mpe2" runat="server"
            BehaviorID="mpe2"
            TargetControlID="PreviewNotesBtn"
            PopupControlID="reviewDiv"
            BackgroundCssClass="modalBackgroundClass"
            DropShadow="false"
            CancelControlID="BackBtn" >
       </ajaxToolkit:ModalPopupExtender>
<div id="reviewDiv" align="center" style="border: 1px double #000000; display:none;
width:750px; height: 600px; top: 780px; overflow-y:scroll; position: relative; word-wrap:
break-word; background-color: #FFFFFF;" runat="server">
<table cellpadding="0" cellspacing="0" style="width: 730px;" border="0" bgcolor="White" align="left">
<tr>
  <td></td>
      <td colspan="3" align="left"><asp:Label ID="MeetingInfoRvw" runat="server" Text=""></asp:Label>
 </td>
<td></td>
</tr>
<tr>
<td> </td>
<td colspan="3" align="right"><asp:Button ID="BackBtn" runat="server" Text="Back" /></td>
<td> </td>
</tr>
</table>
    </div>  
     <%'~~~~~~~   END REVIEW PANEL     ~~~~~~~~~~~~~~~~~~ %>

Don't worry about the table tags - I cut a bunch out.  I have everything else working on the page but this.  

JS