How do I insert rows into an existing table?

I have a table with rows 1, 2, and 4. How can I insert row 3 between 2 and 4? I have a simple table with the last row being Submit. There will be rows added as an OnChange event, but I need the submit to stay at the bottom.
 
Table rows:
<asp:TableRow ID="NumberOfFilesRow" runat="server"> <asp:TableCell ID="NumberOfFilesCell1" runat="server" HorizontalAlign="Right"> <asp:Image ID="NumberOfFilesHelp" runat="server" ImageUrl="~/Images/question.gif" ToolTip="Enter the number of files to download from the FTP server.&#013;This does not include the flag file.&#013;If unzip function is used, enter filenames after the file zip file is unzipped." /> <asp:Label ID="lNumberOfFiles" runat="server" Text=&quo ...