How to append a string in table cells if and only if that table cell is not empty?
<pre><code>&lt;table&gt;
&lt;tr&gt;
  &lt;td&gt;aaaa&lt;/td&gt;
  &lt;td&gt;bbbb&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
  &lt;td&gt;&lt;/td&gt; 
  &lt;td&gt;ccccc&lt;/td&gt;
&lt;/tr&gt;
&lt;/table&gt;
</code></pre>

<p>For above table, how can i append a string "iString" to the cell data "aaaa", "bbbb" and "cccc". But not for the empty cell.</p>
