Why can't I get poster videos to work in a blog?

I’ve been trying for the last week to get poster videos to work in a blog, and I can’t for the life of me do it.

The code I’ve tried most recently is from here , and you can see the magnificent results .

I’ve already embedded lots of videos in the blog, but all of the videos load automatically when someone comes to the page. I want to make them poster videos so that people can click the videos they want to load and the page itself will load much faster…

thanks and have a good one…

You seem to be missing a couple < tags.

On second look,
there are these break<br /> tags disecting the code.