Change Embed SRC For YouTube Video

I'm not using any framework so I'm not looking for any jquery shorthand. I just need to change the youtube video with a click.

Code:
<script type="text/javascript">
function changeVideo(vidSrc){
var link = vidSrc.href + "?version=3&hl=en_US&rel=0";
var movie = document.getElementById('embeddedMovie');
movie.setAttribute("src", link);
alert('SRC: ' + document.getElementById('embeddedMovie').src);
return false;
}

And the html:
Code:
<object width="560" height="315">
<param name="movie" id="embeddedParam" value="[URL]"></param>
<param name="allowFullScreen" value="true"></param>
<param name="allowscriptaccess" value="always"></param>
<embed id="embeddedMovie" src="[URL]" type="application/x-shockwave-flash" width="560" height="315" allowscriptaccess="always" allowfullscreen="true">
</embed></object>

The alert shows that the source is changing however the page just goes blank and the src is not updated in the markup. I also tried updating the parameter along with the movie but still no luck. Does the same on all browsers. If I use the same technique for images it works so I don't believe it to be any DOM loading issue.