S.
Try putting the code in a gist on GitHub then use the 'embed' link on
the gist page in your blog post (this adds a script to the page, so it
doesn't fit your 'simple html' requirements [1] , but I thought it's a
neat alternative anyway).
Cheers,
--
Miron Brezuleanu
[1] The script does add simple html + css though, at least that'st
what a bit of inspection with Firebug reveals.