reading multiple binary files

HTML

<input type="file" id="files" name="files[]" multiple />
<output id="list"></output>

CSS

.thumb {
    height: 75px;
    border: 1px solid #000;
    margin: 10px 5px 0 0;
}

JavaScript

function handleFileSelect(evt) {
    var files = evt.target.files; // FileList object

    for (var i = 0, f; f = files[i]; i++) {
      if (!f.type.match(/image/)) { continue; }

      var reader = new FileReader();

       // Closure to capture the file information.
      reader.onload = (function(theFile) {
        return function(e) {
          // Render thumbnail.
          var span = document.createElement('span');
          span.innerHTML = ['<img class="thumb" src="', e.target.result,
                            '" title="', escape(theFile.name), '"/>'].join('');
          document.getElementById('list').insertBefore(span, null);
        };
      })(f);

      // Read in the image file as a data URL.
      reader.readAsDataURL(f);
    }
  }

  document.getElementById('files').addEventListener('change', handleFileSelect, false);