function get_content(url, div_id) {
  var req;
  if (window.XMLHttpRequest) {
    req = new XMLHttpRequest();
  } else if (window.ActiveXObject) {
    req = new ActiveXObject("Microsoft.XMLHTTP");
  }
 
  if (req != undefined) {
    req.onreadystatechange = function() {
      if (req.readyState == 4) { // only if req is "loaded"
        if (req.status == 200) { // only if "OK"
          document.getElementById(div_id).innerHTML = req.responseText;
	}
      }
    };
 
    req.open("GET", url, true);
    req.send("");
  }
}