JQM streaming youtube - can listen to audio but video not streaming

JQM streaming youtube - can listen to audio but video not streaming

Hi this is my body for the page.

  1. <div data-role="content" >
  2.        
  3.        <div  align="left">
  4.             
  5.                 <h3>  Video</h3>
  6.            <iframe width="300" height="300" src="http://www.youtube.com/embed/dR8lt_NkfDI?rel=0"
  7.                frameborder="0" allowfullscreen></iframe>
  8.            
  9.         </div>

But I can only listen to the audio and no video is being shown. Anyway i can fix this?