I have a ajax request in a function like so:

em = function(url)
{
        var percent;
        new Ajax.Request(url,
        {
                method: 'get',
                onSuccess: function(transport)
                {
                        var Bar = $('emBar');
                        percent = transport.responseText;
                        Bar.setStyle({ width: percent + '%' });
                }
        });
}

And then I have another function that has a PeriodicalExecuter that
runs the first function.
The problem is I can't figure out how to make it so the first function
returns the percent variable so that the PeriodicalExecuter will stop
when it hits a certain number.
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