Problems embedding video into post

Ok, I’ve tried high and low, but still keep having problems embedding certain videos into my Spun-themed homepage.

I succeded in adding a Vimeo video by using:

[embed]<a href="https://vimeo.com/5726800">https://vimeo.com/5726800</a>[/embed]

But I can’t seem to embed a clip from moveclip.com. For some reason using:

[embed]http://movieclips.com/2XWx-requiem-for-a-dream-movie-were-on-our-way/[/embed]

won’t work. Neither does using the embed code function to get the following code:

<div class="movieclips-player" style="background:#000; margin:0; padding:7px 0; width:560px; -moz-border-radius:7px; -webkit-border-radius:7px; border-radius:7px;">
<object width="560" height="304" type="application/x-shockwave-flash" data="http://static.movieclips.com/embedplayer.swf?shortid=2XWx" style="display:block; overflow:hidden;">
<param name="movie" value="http://static.movieclips.com/embedplayer.swf?shortid=2XWx" />
<param name="wmode" value="transparent" />
<param name="allowscriptaccess" value="always" />
<param name="allowfullscreen" value="true" />
<embed src="http://static.movieclips.com/embedplayer.swf?shortid=2XWx" type="application/x-shockwave-flash" width="560" height="304" wmode="transparent" allowscriptaccess="always" allowfullscreen="true"></embed>
</object>
<div style="display:block; margin:7px 0 0; padding:0; width:560px; height:27px; text-align:center; font:normal 11px/11px Helvetica, Arial, Sans-serif; color:#666;">
<a href="http://movieclips.com/2XWx-requiem-for-a-dream-movie-were-on-our-way/" style="display:inline; font-size:12px; line-height:1.23em; color:#00AEFF; text-decoration:none; background:#000;">
We're on Our Way
</a>
<br />
<a href="http://movieclips.com/swY56-requiem-for-a-dream-movie-videos/" style="display:inline; color:#888; text-decoration:none; background:#000;">
Requiem for a Dream
</a>
— MOVIECLIPS.com
</div>
</div><!--0.00204801559448-->

I’m probably overlooking something really simple, I just don’t know what.

Thanks a lot for any feedback.

Lasse