Javascript error - Looping through people list

[atas3]

I found a problem in javascript function appendCircled, which should be:

$('#visiblePeople').append('Number of people visible to this app: ' +
          **people.length** + '<br/>');
      for (var personIndex in people) {
        person = **people[personIndex]**;
        $('#visiblePeople').append('<img src="' + person.image.url + '">');
      }

I had to change this to make it work.
Cheers