Clicking on the tall image does launch the Floatboxed video in the size I asked for as expected.
I had intended to do an expanding roll-over button, either with the fbPopcenter two-img construct, or a CSS background image shift method, but neither of my attempts seem to work when the anchor link is a Youtube short URL.
This is what gives me the long thin startframe image instead of my button:
<a href="http://youtu.be/YygcjC_eEfk" class="floatbox" data-fb-options="width:800 height:450" title="Click/Tap for Jodie's Video">
<img src="images/HasVideo20_3.gif" width="20" height="20" alt="Click/Tap for Jodie's Video" title="Click/Tap for Jodie's Video" />
</a>
If I make the URL be "#" I get my button back. Alternatively, adding fetchVideoInfo:false in the options puts a grey play button in place of mine.
I'm stumped...
V.6.0.4
Dave