var i, l, file, imageType, img, reader;
for (i = 0, l = files.length; i
file = files[i];
imageType = /image.*/;

if (!file.type.match(imageType)) {
continue;
}

img = document.createElement("img");
img.classList.add("obj");
img.file = file;
preview.appendChild(img);

reader = new FileReader();
reader.onload = (function(aImg) { return function(e) { aImg.src = e.target.result; }; })(img);
reader.readAsDataURL(file);
}
}