title: How to make an embedded Youtube video automatically start playing?
body: <p>In my project, there is a video gallery module. In this module, there are two options: direct FLV uploading, and adding a video embed code from YouTube. </p>
  
  <p>I am writing some embed code for a div element (actually, the embed code comes from database). I want to make this video begin playing automatically.</p>
  
  <pre><code>&lt;iframe title="YouTube video player" width="480" height="390" src="http://www.youtube.com/embed/zGPuazETKkI" frameborder="0" allowfullscreen&gt;&lt;/iframe&gt;
  </code></pre>
  
  <p>This is a sample embed code from YouTube. I want to make this video play automatically using JavaScript.</p>