diff --git a/misc/ajax.js b/misc/ajax.js
index bb4a6e1..47c4773 100644
--- a/misc/ajax.js
+++ b/misc/ajax.js
@@ -230,16 +230,16 @@ Drupal.ajax = function (base, element, element_settings) {
  * will test to see if the key press is valid to trigger this event and
  * if it is, trigger it for us and prevent other keypresses from triggering.
  * In this case we're handling RETURN and SPACEBAR keypresses (event codes 13
- * and 32. RETURN is often used to submit a form when in a textfield, and 
- * SPACE is often used to activate an element without submitting. 
+ * and 32. RETURN is often used to submit a form when in a textfield, and
+ * SPACE is often used to activate an element without submitting.
  */
 Drupal.ajax.prototype.keypressResponse = function (element, event) {
   // Create a synonym for this to reduce code confusion.
   var ajax = this;
 
   // Detect enter key and space bar and allow the standard response for them,
-  // except for form elements of type 'text' and 'textarea', where the 
-  // spacebar activation causes inappropriate activation if #ajax['keypress'] is 
+  // except for form elements of type 'text' and 'textarea', where the
+  // spacebar activation causes inappropriate activation if #ajax['keypress'] is
   // TRUE. On a text-type widget a space should always be a space.
   if (event.which == 13 || (event.which == 32 && element.type != 'text' && element.type != 'textarea')) {
     $(ajax.element_settings.element).trigger(ajax.element_settings.event);
@@ -476,7 +476,14 @@ Drupal.ajax.prototype.getEffect = function (response) {
  * Handler for the form redirection error.
  */
 Drupal.ajax.prototype.error = function (xmlhttprequest, uri, customMessage) {
-  alert(Drupal.ajaxError(xmlhttprequest, uri, customMessage));
+  if (xmlhttprequest.status >= 400) {
+    if (window.console) {
+      console.log(Drupal.ajaxError(xmlhttprequest, uri, customMessage));
+    }
+    else {
+      alert(Drupal.ajaxError(xmlhttprequest, uri, customMessage));
+    }
+  }
   // Remove the progress element.
   if (this.progress.element) {
     $(this.progress.element).remove();
diff --git a/misc/autocomplete.js b/misc/autocomplete.js
index d71441b..c866d29 100644
--- a/misc/autocomplete.js
+++ b/misc/autocomplete.js
@@ -310,7 +310,15 @@ Drupal.ACDB.prototype.search = function (searchString) {
         }
       },
       error: function (xmlhttp) {
-        alert(Drupal.ajaxError(xmlhttp, db.uri));
+        if (xmlhttp.status >= 400) {
+          if (window.console) {
+            console.log(Drupal.ajaxError(xmlhttp, db.uri));
+          }
+          else {
+            alert(Drupal.ajaxError(xmlhttp, db.uri));
+          }
+        }
+
       }
     });
   }, this.delay);