el.js

function addEvent(element, event, fn) {
    if (element.addEventListener) {
      element.addEventListener(event, fn, false);
    } else if (element.attachEvent) {
      element.attachEvent('on' + event, fn);
    }
}
function newText() {
  document.getElementById("ovText").innerHTML = "<span class='questionSpan reqQuestion'><label for='overall'>Overall Experience</label></span>";
}

addEvent(window, 'load', newText);