Show/hide drop down if a certain selection is made in previous drop down
<p>I have a form. I want to disable or enable a drop down depending on a radio button selection. I need to do this several times in the form. I am new to Javascript so I dont really know where to start. this is a part of the form:</p>

<pre><code>&lt;p id="hospitalorientation"&gt;&lt;label&gt;Hospital Orientation:&lt;/label&gt;
&lt;div id='buttons'&gt;
 &lt;label&gt;&lt;input type="radio" name="hospital" /&gt; Not Complete &lt;/label&gt;
&lt;label&gt;&lt;input type="radio" name="hospital" /&gt; Complete &lt;/label&gt;
&lt;/div&gt;
&lt;div id="list1" style="display: none;"&gt;
 &lt;label&gt;Month Complete: 
&lt;select&gt;
  &lt;option&gt;January&lt;/option&gt;
  &lt;option&gt;February&lt;/option&gt;
    &lt;option&gt;March&lt;/option&gt;
    &lt;option&gt;April&lt;/option&gt;
    &lt;option&gt;May&lt;/option&gt;
    &lt;option&gt;June&lt;/option&gt;
    &lt;option&gt;July&lt;/option&gt;
    &lt;option&gt;August&lt;/option&gt;
    &lt;option&gt;September&lt;/option&gt;
    &lt;option&gt;October&lt;/option&gt;
    &lt;option&gt;November&lt;/option&gt;
    &lt;option&gt;December&lt;/option&gt;
&lt;/select&gt;
&lt;/label&gt;
&lt;/div&gt;
</code></pre>

<p>and then i have basically several replicas of this in the form..</p>

<pre><code>&lt;p id="ppd"&gt;&lt;label&gt;PPD:&lt;/label&gt;
&lt;div id='buttons'&gt;
&lt;label&gt;&lt;input type="radio" name="ppd" /&gt; Not Complete &lt;/label&gt;
&lt;label&gt;&lt;input type="radio" name="ppd" /&gt; Complete &lt;/label&gt;
&lt;/div&gt;
&lt;div id="list2" style="display: none;"&gt;
  &lt;label&gt;Month Complete: 
    &lt;select&gt;
      &lt;option&gt;January&lt;/option&gt;
      &lt;option&gt;February&lt;/option&gt;
      &lt;option&gt;March&lt;/option&gt;
      &lt;option&gt;April&lt;/option&gt;
      &lt;option&gt;May&lt;/option&gt;
    &lt;option&gt;June&lt;/option&gt;
    &lt;option&gt;July&lt;/option&gt;
    &lt;option&gt;August&lt;/option&gt;
    &lt;option&gt;September&lt;/option&gt;
    &lt;option&gt;October&lt;/option&gt;
    &lt;option&gt;November&lt;/option&gt;
    &lt;option&gt;December&lt;/option&gt;
&lt;/select&gt;
</code></pre>

<p>
</p>

<p>And now I dont really know where to go from there.</p>
