automatically correct spelling

I use the following mapping to search backwards and correct automatically the first found misspelling.
The first option is the correct one in almost all cases.
nmap l ma[S1z=tr

it includes the following nested mappings.
The `tr' colors the corrected word, this makes it easy to spot incorrect or potentially
outrageous corrections.

nmap tr :exe "call matchadd('WildMenu','\\%".line('.').'l'.expand("\<cword\>") . "')"<CR>
nmap tl `a

How would I configure vim to automatically fire this macro when a word is misspelt,
like mainstream word processors do?

--
Eric Smith

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