Javascript bug….. anons know all

THIS WORKS:

var one = document.getElementById('myimg');

var two = document.getElementById('myimg2');

one.src = e.target.result;

two.src = e.target.result;

THIS DOES NOT:

document.getElementById('myimg').src = e.target.result;

document.getElementById('myimg2').src = e.target.result;

WHY????