is it possible to high a block of code?

[Stephen Eglen]

Hi Andy,

as well as the other suggestions (narrowing, and outline mode),
emacswiki.org has the following, which seems to hide a currently
defined region.  If you want to mark up hideable regions using regexps
in your text, I doubt this will work, but the author of this package
might be able to point you in the right direction.

http://www.emacswiki.org/cgi-bin/wiki/HideRegion

best wishes, stephen