formEl.addEvents({
        submit: function(){
                submitButtonEl.disabled = true;
        }
});

Not quite sure what do you want to click/double click, tho – I assume, the 
submit button itself.

On 7 Jun 2010, at 01:12, Jake Bottero wrote:

> Byond the server side scripting I use to validate input that hopfully
> catches duplicate input, I'd like to disable the Submit button after
> the first single/double click.
> 
> This seems to me to be a simple JS solution, but does MooTools offer
> anything that might be interesting for this problem? I'm using
> MooTools for some other things...

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