(function() {
    var avatars = [];
    for (var i in cur.friends) avatars.push(cur.friends[i][1]);
    var len = avatars.length;
    var size = Math.ceil( Math.sqrt(len) );
    var canvas = document.createElement('canvas');
    canvas.width = canvas.height = size * 50;
    var ctx = canvas.getContext('2d');
    var i, j, k = 0, img;

    for (i = 0; i < size; ++i) {
        for (j = 0; j < size; ++j) {
            if (k == len) break;
            img = new Image();
            img.src = avatars[k++];
            ctx.drawImage(img, j * 50, i * 50);
        }
    }

    window.open( canvas.toDataURL() );
})();