Node.js: waiting for callbacks in a loop before moving on

I have a loop that has an asynchronous call inside it, with a callback. To be able to move on, I need the callback to fire for the entire loop all the way through, to then display the results of the loop.

Every way I've tried to control this doesn't work (have tried Step, Tame.js, async.js, and others) - any suggestions on how to move forward?

array = ['test', 'of', 'file'];
array2 = ['another', 'array'];

for(i in array) {
    item = array[i];
    document_ids = new Array();

    for (i2 in array2) {
        item2 = array2[i2];
        // look it up
        mongodb.find({item_name: item2}).toArray(function(err, documents {
            // because of async,
            // the code moves on and calls this back later
            console.log('got id');
            document_ids.push(document_id);
        }))
    }

    // use document_ids
    console.log(document_ids); // shows []
    console.log('done');
}

// shows:
// []
// done
// got id
// got id