title: how to do onclick event Enable/Disable using single button
body: <pre><code>&lt;button&gt; Change Onclick&lt;/button&gt;
  &lt;ul id="myorder"&gt; 
      &lt;li&gt; &lt;a href="#" onclick="popone();"&gt; &lt;/a&gt; &lt;/li&gt;
      &lt;li&gt; &lt;a href="#" onclick="poptwo();"&gt; &lt;/a&gt; &lt;/li&gt;    
  &lt;/ul&gt;
  </code></pre>
  
  <p>When I click on the button the first time the <code>onClick</code> must be disabled. After the second click on the button the <code>onClick</code> must enabled. How I do this? Can you help me? Can you give me jquery code?</p>