$("input[name='profile_img']").change(function(e){
    e.preventDefault();

    var file = this.files[0];
        reader = new FileReader();

    reader.onload = function (event) {
        var img = new Image();
        img.src = event.target.result;
        if (img.width > 700 || img.height > 500) { // holder width
          img.width = 700;
          img.height = 500;
        }
        $('#holder').empty();
        $('#holder').append(img);
    };
    reader.readAsDataURL(file);

    return false;
});


<!-- DY가 짠 첨부파일 미리보기 소스-->
<script>
var upload = document.getElementsByTagName('input')[0],
    holder = document.getElementById('holder');

upload.onchange = function (e) {
    e.preventDefault();

    var file = upload.files[0],
        reader = new FileReader();


    reader.onload = function (event) {
        var img = new Image();
        img.src = event.target.result;
        if (img.width > 700 || img.height > 500) { // holder width
          img.width = 700;
          img.height = 500;
        }
        holder.innerHTML = '';
        holder.appendChild(img);
    };
    reader.readAsDataURL(file);

    return false;
};
</script>