title: Text box appear on radio button check
body: <p>I have the following..</p>
  
  <pre><code>&lt;table id='table_columns'&gt;
      &lt;td align="center"&gt;
          &lt;input type="radio" name="WIDTH" value="1" &lt;?php echo ($config-&gt;get('WIDTH','COLUMNS') == "1")?'CHECKED':'';?&gt; /&gt;
          &lt;p&gt;4 Columns&lt;/p&gt;
      &lt;/td&gt;
      &lt;td align="center"&gt;
          &lt;input type="radio" name="WIDTH" value="2" &lt;?php echo ($config-&gt;get('WIDTH','COLUMNS') == "2")?'CHECKED':'';?&gt; /&gt;
          &lt;p&gt;3 Columns&lt;/p&gt;
      &lt;/td&gt;
      &lt;td align="center"&gt;
          &lt;input type="radio" name="WIDTH" value="3" &lt;?php echo ($config-&gt;get('WIDTH','COLUMNS') == "3")?'CHECKED':'';?&gt; /&gt;
          &lt;p&gt;Custom&lt;/p&gt;
      &lt;/td&gt;
      &lt;tr&gt;
          &lt;td align="right"&gt;
              &lt;p&gt;Column 1&lt;/p&gt;
          &lt;/td&gt;
          &lt;td align="left"&gt;
              &lt;input class="txt" size="3" maxlength="3"  name="WIDTH1" Title="Insert the desired width" value="&lt;?php echo $config-&gt;get('WIDTH1','COLUMNS')?&gt;" /&gt;
          &lt;/td&gt;
      &lt;/tr&gt;
  </code></pre>
  
  <p></p>
  
  <p>When the Custom radio button is checked I would like the text box below to appear. If any of the other radio buttons are checked I don't want it to show. How would I do this?</p>
  
  <p>Thanks</p>