highlight all words matching the word under the cursor

Hi,
I'm looking for a way to highlight words that match the word under the
cursor.
I tried to put in my vimrc the following:
:autocmd CursorMoved *.cc,*.h,*.java exe printf('match IncSearch /\<%s
\>/', expand('<cword>'))

This works but it's a bit slow, and I don't really need it all the
time, Can someone add some info about how to toggle this behavior on a
function key (or a <Leader> h)?

Thanks,
Reuven.

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