function resizeContent() {
  var content = document.getElementById("content");
  var contentSize = document.getElementById("contentSize");
  if (content != null && contentSize != null) {
    content.style.width = "100px";
    content.style.height = "100px";
    content.style.width = contentSize.offsetWidth + "px";
    content.style.height = contentSize.offsetHeight + "px";
  }
}

window.onresize = resizeContent;