how to create new input method?

[Tamas]

Hi,

I would like to create a new input method for MULE because none of the
existing ones are well-suited to Hungarian (which has long double
acute accents like ő and ű).

I just need the following prefix mappings (for small and capital
vowels):

' + aeuio => these letters with single acute accent
" + ou => these letters with umlaut
~ + ou => these letters with double acute accent

Could someone please get me started with some template code that I
could put in my .emacs file and would create this input method?  I can
figure out the details (character mappings etc).

I am using Emacs 23.0.0.1.

Thanks,

Tamas