Access values in array

I'm trying to understand this code and how I can access the values that have been added to the array.

Once the values have been added to array, how can I access id and url?

    var photoList = {};
    var toUpload;
    var id = $(this).attr('id');
    var url = $(this).attr('rel');

            toUpload = { id: id, url: url };
            if (id in photoList) {
                delete photoList[id];
            }
            else {
                photoList[id] = toUpload;
            }

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