gistfile1.js

<script>
  function resizeElementHeight(element) {
    var height = 0;
    var body = window.document.body;
    if (window.innerHeight) {
       height = window.innerHeight;
    } else if (body.parentElement.clientHeight) {
       height = body.parentElement.clientHeight;
    } else if (body && body.clientHeight) {
       height = body.clientHeight;
    }
    element.style.height = ((height - element.offsetTop) + "px");
  }
</script>