<script>    function readURL(input) {
        if (input.files && input.files[0]) {
            var reader = new FileReader();
            reader.onload = function (e) {
                $('#blah').attr('src', e.target.result).width(100).height(100);
            };
            reader.readAsDataURL(input.files[0]);
        }
    }
</script>

<img id="blah" src="<?php echo getImage('boy.png'); ?>" width="100px" height="100px">

onchange="readURL(this);" //it should to be use with input field //type="file"