Some sites disable Frames to avoid highjacking
Although this is not the case, the security measures are still in place meaning we cannot use a frame.
Luckily for you we can include the video other ways then just the frame
Here are a ton of options: YouTube APIs and Tools - Google Code
Here is what I suggest using:
<object style="height: 390px; width: 640px">
<param name="movie" value="http://www.youtube.com/v/u1zgFlCw8Aw?version=3">
<param name="allowFullScreen" value="true">
<param name="allowScriptAccess" value="always">
<embed src="http://www.youtube.com/v/u1zgFlCw8Aw?version=3" type="application/x-shockwave-flash" allowfullscreen="true" allowScriptAccess="always" width="640" height="390"></object>
Note, You will have to change what's in bold
to match your video.
More info: YouTube Player Demo - YouTube APIs and Tools - Google Code