Enable option / disable option

On Superuser I found this nice way to highlight the word under the
cursor for the whole page:
:autocmd CursorMoved * exe printf('match IncSearch /\V\<%s\>/',
escape(expand('<cword>'), '/\'))

http://superuser.com/questions/255024/vim-highlighting-a-search-term-without-moving-the-cursor

I would like to enable / disable this feature, for instance on
<leader>h. Is there any way to do this? I could write a function to
set the option, but how to disable it afterwards, and how to check the
state so that the same key could toggle?

Thanks.

--
Dotan Cohen

http://gibberish.co.il
http://what-is-what.com

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