gvim - omnicompletiton problems with html files

Hi,

In my ~/.vimrc setup I set the following function and autocmd

function! GuiSave()

   if has('gui_running')   

      if empty(bufname(''))

         browse confirm write

     else

         confirm write

      endif

   endif

endfunction

:vnoremap <silent> <C-s> :call GuiSave()<CR>

:nnoremap <silent> <C-s> :call GuiSave()<CR>

:inoremap <silent> <C-s> <C-O>:call GuiSave()<CR>

But when I have to edit some HTML file, after typing each word gvim returns 

E764: option 'omnifunc' is not set

or when I press C-s sometimes gvim prints the call to GuiSave(), for example

<h5>:call GuiSave()

which is quiet annoying.

Inserting the autocmd line 

autocmd FileType html,markdown setlocal omnifunc=htmlcomplete#CompleteTags

does not solve the problem

What is the right way to solve this issue ? Honestly I am not interested in autocompletion at all.

Regards.

s.

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