html 5 video code

To whom it may concern,

I was curious about switching my xhtml coded site to html5.  Is this  
recommended by you now?  What about video code - if the code is  
incorrect, will it prevent an embedded video off of YouTube to play?   
I read a article on Mac forum that certain websites have html5 video  
to work with iPad and when I checked their source, I saw that they  
are flash videos which the iPad is not supposed to be able to play.  
So is it because they were coded with html5?  I am confused about  
this and would appreciate any clarification by you.  I finally, by  
the grace of Jesus, was able to validated a few of my pages on my  
site and now I have to switch but don't want to do that if it isn't  
necessary.  Help, please.

http://muralsandfauxpainting.com


God bless you,
Sandy Silva
President
Murals and Faux Painting, Inc.