Setting select box value to empty or null
<p>I have a select box as following:</p>

<pre><code>&lt;select id="yui_3_2_0_1_1367209425865256" class="rsNoDrag" name="resp262_1"&gt;

&lt;option&gt;&lt;/option&gt;
&lt;option value="643"&gt;Not exhibited in last 30 days.&lt;/option&gt;
&lt;option value="644"&gt;This type exhibited 1 - 5 days.&lt;/option&gt;
&lt;option value="645"&gt;This type exhibited daily or almost daily.&lt;/option&gt;

&lt;/select&gt;
</code></pre>

<p>I am accessing this select box via another select box via name. the other select box is as following:</p>

<pre><code>&lt;select id="yui_3_2_0_1_1367209425865200" class="rsNoDrag" name="resp394_1"&gt;
&lt;option&gt;&lt;/option&gt;
&lt;option selected="selected" value="919"&gt;None of the above indicators. &lt;/option&gt;
&lt;/select&gt;
</code></pre>

<p>This is how i am getting the value of selectbox:</p>

<pre><code>var abc = $('select[name=resp394_1] option:selected').val();
</code></pre>

<p>Now when <code>abc == 919</code>, i want the first text box to become empty. there is no <code>"value"</code> for the empty field in the first select box nor any other way to access it. <code>&lt;option&gt;&lt;/option&gt;</code> indicates <code>''</code>.</p>
