este es el codigo que subi
<div id="contenedor">
<iframe width="640" height="360" src="https://www.youtube.com/embed/wx3sBpPD0sw?rel=0&showinfo=0" frameborder="0" allowfullscreen></iframe>
</div>
<div id="miniatura">
<a href="https://www.youtube.com/v/wx3sBpPD0sw" onclick="return cambio(this.href)"><img src= "https://i3.ytimg.com/vi/wx3sBpPD0sw/default.jpg"/></a>
</div>