Button Click Return Null Value?

Jul 4, 2012

this code runs fine for single row <tr> </tr>, but when i  use multiple table rows as given below javascript alert box shows  null value ,, how can i correct  my script for it ??

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>Untitled Page</title>

[Code]......

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