gistfile1.js

function createRequest() {
    var result = null;
    if (window.XMLHttpRequest) {
      result = new XMLHttpRequest();
      if (typeof xmlhttp.overrideMimeType != 'undefined') {
        result.overrideMimeType('text/xml'); // Or anything else
      }
    }
    else if (window.ActiveXObject) {
      // MSIE
      try { result = new ActiveXObject("Microsoft.XMLHTTP");}
      catch(err){ try{result = new ActiveXObject("MSXML2.XMLHTTP");}
      catch(err){}
    } 
    else {
      // No known mechanism -- consider aborting the application
    }
    return result;
}

for ( i =1; i<=entry.openSearch$totalResults.$t;i+=10) {
  
  var req = createRequest(); // defined above
  // Create the callback:
  req.onreadystatechange = function() {
    if (req.readyState != 4) return; // Not there yet
    if (req.status != 200) {
      // Handle request failure here...
      return;
    }
    // Request successful, read the response
    var resp = req.responseText;
    // ... and use it as needed by your app.
  }
  var link = document.createElement('a');
  link.href = '#';
  link.onclick = function(){req.open("GET", 'http://books.google.com/books/feeds/volumes?q=' + encodeURIComponent(query) + '&min-viewability=partial' + '&start-index=' + i + '&alt=json-in-script&callback=handleResults', true); return false};
  textElem.innerHTML = i + ' ';
  link.appendChild(textElem);
  document.getElementById("bookBar").appendChild(link);
}