get total of dynamic clone rows
<p>I'm doing jquery based order sheet.
As i searched similar question, there are hundreds of way to get total value of each TABLE ROW.
But in my case, Total value fires strange way.</p>

<p>Full source code is uploaded to jsfiddle.</p>

<p><a href="http://jsfiddle.net/pR9Qd/" rel="nofollow">http://jsfiddle.net/pR9Qd/</a></p>

<p>There are two main problem.</p>

<ol>
<li><p>Total value of .total_amount is strange. it's bigger than sum of each .amount</p></li>
<li><p>When i delete some rows, the .total_amount won't changed.</p></li>
</ol>

<p>Thanks in advance.</p>
