if input(type=text) has value, then enable select element
<p>I have a table, has many rows. for example one of from rows(all rows are same):</p>

<pre><code>             &lt;tr&gt;
                &lt;td&gt;
                    &lt;input type="text" /&gt;
                &lt;/td&gt;
                &lt;td&gt;
                    &lt;textarea cols="40" rows="3" &gt;&lt;/textarea&gt;
                &lt;/td&gt;
                &lt;td&gt;
                    &lt;select id="chbTypes11"&gt;
                        //options
                    &lt;/select&gt;
                &lt;/td&gt;
                &lt;td&gt;
                    &lt;input type="text" /&gt;
                &lt;/td&gt;
                &lt;td&gt;
                    &lt;input type="checkbox" /&gt;
                &lt;/td&gt;
            &lt;/tr&gt;
</code></pre>

<p>select element is disabled by default.
How to determine, input value has value? for enabling select element in this row</p>
