existance of :diffoff

I use vim on Mac, Linux, Windows with versions 6 and 7.

:diffoff! works with version 7 but does not exist in version 6.

Currently I do this:

function! DiffOff()
if v:version < 700
windo set nodiff foldcolumn=0 noscrollbind nowrap scrollopt-=hor
else
diffoff!
endif
close
endf

Is there a way to specifically check for the existence of :diffoff! ?

And is this function sufficient?

Bill

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