On text-box length greater then zero clear listbox and disable
<p>Is it possible in java script that when a text box control is populated that it clears my list box and disables it and visa versa.  I'm using ASP.net C# to bind the list box.</p>

<pre><code>&lt;asp:TextBox ID="_tx_Zip" On??? runat="server" Width="197px"&gt;&lt;/asp:TextBox&gt;

&lt;asp:ListBox ID="_lb_Zip" runat="server" Height="82px" SelectionMode="Multiple" Width="200px"&gt;
</code></pre>

<p>I was messing around with the OnTextChanged event but that's no good. Sorry I'm trying to learn java script.</p>
