script.js

function includeHTML() {
  var z, i, elmnt, file, xhttp;

  z = document.getElementsByClassName("w3-include-html");
  for (i = 0; i < z.length; i++) {
    elmnt = z[i];
    
    /*search for elements with a certain atrribute:*/
    file = elmnt.getAttribute("w3-include-html");
    
    if (file) {
      /* Make an HTTP request using the attribute value as the file name: */
      xhttp = new XMLHttpRequest();
      xhttp.onreadystatechange = function() {
        if (this.readyState == 4) {
          if (this.status == 200) {elmnt.innerHTML = this.responseText;}
          if (this.status == 404) {elmnt.innerHTML = "Page not found.";}
          /* Remove the attribute, and call this function once more: */
          elmnt.removeAttribute("w3-include-html");
          includeHTML();
        }
      } 
      xhttp.open("GET", file, true);
      xhttp.send();
      /* Exit the function: */
      return;
    }
  }
}

if(window.attachEvent) {
    window.attachEvent('onload', includeHTML);
} else {
    if(window.onload) {
        var curronload = window.onload;
        var newonload = function(evt) {
            curronload(evt);
            includeHTML(evt);
        };
        window.onload = newonload;
    } else {
        window.onload = includeHTML;
    }
}