var req;
	  var which;


   function retrieveURLArch(url) {

    if (window.XMLHttpRequest) { // Non-IE browsers
      req = new XMLHttpRequest();
      req.onreadystatechange = processStateChange;
      try {
        req.open("GET", url, true);
      } catch (e) {
        alert(e);
      }
      req.send(null);
    } else if (window.ActiveXObject) { // IE
      req = new ActiveXObject("Microsoft.XMLHTTP");
      if (req) {
        req.onreadystatechange = processStateChange;
        req.open("GET", url, true);
        req.send();
      }
    }
  }
 
  function processStateChange() {
    if (req.readyState == 4) { // Complete
      if (req.status == 200) { // OK response
        document.getElementById("archive").innerHTML = req.responseText;
      } else {
        alert("Problem: " + req.statusText);
      }
    }
  }