How to call mappings in a function

Hi,

I have two mappings:

CTRL-A, which selects everything in the buffer

CTRL-F3, which makes everything lowercase

How to execute this within the call of a function?

The function below gives E488

 function! MakeEveryThingLowerCase()
" <C-a>, Select everything
  <C-O>gg<C-O>gH<C-O>G<return>
"<C-F3>, Makelower case
      <esc>gvgu<return>
    endfunction

Rgds,

Jeri

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