File preview on HTML5/JS/jQuery

gistfile1.js

    $('form').on('change', 'input[type="file"]', function(e) {

        var files = e.target.files,
            f = files[0],
            reader = new FileReader(),
            t = this
        ;

        reader.onload = (function(file) {

            return function(e) {

                $(t).before($('<img>').attr({

                    src: e.target.result,
                    title: file.name,
                    height: "80",
                    width: ""
                }));
            };
        })(f);

      reader.readAsDataURL(f);
    });