Firefox Div Tag overflow issue

Hi there,
I have a number <div> tags that are dynamically generated by asp code.

I want to show the content of the div tag when an image is clicked on.  I'm trying to
do this by showing and hiding the overflow of the tag.

This works great in IE but fails in FireFox

Can someone please help me with a firefox workaround.

You can see the page at http://www.brewsterswaste.co.uk/new/areas covered.asp

<%
      ' Open a connection to the database
    Set db = Server.CreateObject("ADODB.Connection")
    db.Open session("SQL_STRING"),session("SQL_USERNAME"),session("SQL_PASSWORD")
      
      MySQL = "Exec sp_lo0001"
    set rs = db.execute(MySQL)      
      do until rs.eof = true
      %>
      
      <div id="layer_<%=rs("Location")%>" style="position:relative; height:24px; overflow:hidden;">
      <!-- Location Header - SiteKeywords -->
    <table width="100%" id="Content_Page_Layout" class="Content_Page_Layout" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td width="9" height="20"><img src="images/general%20images/table_left.gif" width="9" height="20"></td>
            <td height="20" width="100%" background="images/general images/table_centre.gif"><%=rs("Location")%></td>
              <td width="20" height="20"><a href="#" onclick="show_locations('layer_<%=rs("Location")%>')" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('Image42','','images/general%20images/table_down_button_on.gif',1)"><img src="images/general%20images/table_down_button_off.gif" name="Image42" width="20" height="20" border="0"></a></td>
            <td width="7" height="20"><img src="images/general%20images/table_right.gif" width="7" height="20"></td>
       </tr>
    </table>
      <!-- Location Header - SiteKeywords -->
      
      
      <!-- PostCodes - SiteKeywords -->
    <table width="100%" id="Content_Page_Layout" class="Content_GreyArea" cellpadding="0" cellspacing="0" border="0">
        <%
        MySQL = "Exec sp_lo0002 @Location='" & rs("Location") & "'"
      set prs = db.execute(MySQL)
        do until prs.eof
        %>
        <tr>
          <td nowrap><%=trim(prs("PostCode"))%></td>
            <td valign="middle" nowrap>&nbsp;-&nbsp;</td>
            <td nowrap>Local Authority</td>
            <td width="100%"></td>
        </tr>
        <%
        prs.movenext
        loop
        %>
    </table>
      <!-- PostCodes - SiteKeywords -->
      </div>
      <%
      rs.movenext
      loop
      %>Start Free Trial