diff --git a/js/db_operations.js b/js/db_operations.js
index 5169b553c..b0536942c 100644
--- a/js/db_operations.js
+++ b/js/db_operations.js
@@ -34,10 +34,7 @@ $(document).ready(function() {
 
         var question = 'CREATE DATABASE ' + $('#new_db_name').val() + ' / DROP DATABASE ' + window.parent.db;
 
-        if (! $form.find('input:hidden').is('#ajax_request_hidden')) {
-            $form.append('<input type="hidden" id="ajax_request_hidden" name="ajax_request" value="true" />');
-        }
-
+        PMA_prepareForAjaxRequest($form);
         /**
          * @var button_options  Object containing options for jQueryUI dialog buttons
          */
@@ -95,9 +92,7 @@ $(document).ready(function() {
 
         var $form = $(this);
         
-        if (! $form.find('input:hidden').is('#ajax_request_hidden')) {
-            $form.append('<input type="hidden" id="ajax_request_hidden" name="ajax_request" value="true" />');
-        }
+        PMA_prepareForAjaxRequest($form);
 
         $.get($form.attr('action'), $form.serialize(), function(data) {
             // use messages that stay on screen
@@ -135,9 +130,7 @@ $(document).ready(function() {
 
         var $form = $(this);
 
-        if (! $form.find('input:hidden').is('#ajax_request_hidden')) {
-            $form.append('<input type="hidden" id="ajax_request_hidden" name="ajax_request" value="true" />');
-        }
+        PMA_prepareForAjaxRequest($form);
 
         PMA_ajaxShowMessage(PMA_messages['strChangingCharset']);
 
diff --git a/js/db_search.js b/js/db_search.js
index 73bea25fb..79c444e85 100644
--- a/js/db_search.js
+++ b/js/db_search.js
@@ -142,10 +142,7 @@ $(document).ready(function() {
         // jQuery object to reuse
         $form = $(this);
 
-        // add this hidden field just once
-        if (! $form.find('input:hidden').is('#ajax_request_hidden')) {
-            $form.append('<input type="hidden" id="ajax_request_hidden" name="ajax_request" value="true" />');
-        }
+        PMA_prepareForAjaxRequest($form);
 
         $.post($form.attr('action'), $form.serialize() + "&submit_search=" + $("#buttonGo").val(),  function(response) {
             if (typeof response == 'string') {
diff --git a/js/functions.js b/js/functions.js
index 1016b2f81..6894e15a4 100644
--- a/js/functions.js
+++ b/js/functions.js
@@ -20,6 +20,18 @@ var only_once_elements = new Array();
  */
 var ajax_message_init = false;
 
+/**
+ * Add a hidden field to the form to indicate that this will be an
+ * Ajax request (only if this hidden field does not exist)
+ *
+ * @param   object   the form
+ */
+function PMA_prepareForAjaxRequest($form) {
+    if (! $form.find('input:hidden').is('#ajax_request_hidden')) {
+        $form.append('<input type="hidden" id="ajax_request_hidden" name="ajax_request" value="true" />');
+    }
+}
+
 /**
  * Generate a new password and copy it to the password input areas
  *
@@ -1403,9 +1415,7 @@ $(document).ready(function() {
         button_options_error[PMA_messages['strOK']] = function() {$(this).dialog('close').remove();}
 
         var $msgbox = PMA_ajaxShowMessage();
-        if (! $form.find('input:hidden').is('#ajax_request_hidden')) {
-            $form.append('<input type="hidden" id="ajax_request_hidden" name="ajax_request" value="true" />');
-        }
+        PMA_prepareForAjaxRequest($form);
 
         $.get($form.attr('action'), $form.serialize(), function(data) {
             //in the case of an error, show the error message returned.
@@ -1467,9 +1477,7 @@ $(document).ready(function() {
             // OK, form passed validation step
             if ($form.hasClass('ajax')) {
                 PMA_ajaxShowMessage(PMA_messages['strProcessingRequest']);
-                if (! $form.find('input:hidden').is('#ajax_request_hidden')) {
-                    $form.append('<input type="hidden" id="ajax_request_hidden" name="ajax_request" value="true" />');
-                }
+                PMA_prepareForAjaxRequest($form);
                 //User wants to submit the form
                 $.post($form.attr('action'), $form.serialize() + "&do_save_data=" + $(this).val(), function(data) {
                     if(data.success == true) {
@@ -1561,9 +1569,7 @@ $(document).ready(function() {
         var $form = $("#create_table_form");
 
         var $msgbox = PMA_ajaxShowMessage(PMA_messages['strProcessingRequest']);
-        if (! $form.find('input:hidden').is('#ajax_request_hidden')) {
-            $form.append('<input type="hidden" id="ajax_request_hidden" name="ajax_request" value="true" />');
-        }
+        PMA_prepareForAjaxRequest($form);
 
         //User wants to add more fields to the table
         $.post($form.attr('action'), $form.serialize() + "&submit_num_fields=" + $(this).val(), function(data) {
@@ -1670,10 +1676,7 @@ $(document).ready(function() {
         $form = $(this);
 
         PMA_ajaxShowMessage(PMA_messages['strProcessingRequest']);
-
-        if (! $form.find('input:hidden').is('#ajax_request_hidden')) {
-            $form.append('<input type="hidden" id="ajax_request_hidden" name="ajax_request" value="true" />');
-        }
+        PMA_prepareForAjaxRequest($form);
 
         $.post($form.attr('action'), $form.serialize(), function(data) {
             if(data.success == true) {
diff --git a/js/sql.js b/js/sql.js
index 8a97eec3a..77717a727 100644
--- a/js/sql.js
+++ b/js/sql.js
@@ -254,9 +254,7 @@ $(document).ready(function() {
         $form = $(this);
         var $msgbox = PMA_ajaxShowMessage();
 
-        if (! $form.find('input:hidden').is('#ajax_request_hidden')) {
-            $form.append('<input type="hidden" id="ajax_request_hidden" name="ajax_request" value="true" />');
-        }
+        PMA_prepareForAjaxRequest($form);
 
         $.post($(this).attr('action'), $(this).serialize() , function(data) {
             if(data.success == true) {
diff --git a/js/tbl_change.js b/js/tbl_change.js
index e5b800fa0..2d33884a9 100644
--- a/js/tbl_change.js
+++ b/js/tbl_change.js
@@ -283,9 +283,7 @@ $(document).ready(function() {
         event.preventDefault();
 
         PMA_ajaxShowMessage();
-        if (! $form.find('input:hidden').is('#ajax_request_hidden')) {
-            $form.append('<input type="hidden" id="ajax_request_hidden" name="ajax_request" value="true" />');
-        }
+        PMA_prepareForAjaxRequest($form);
 
         $.post($form.attr('action'), $form.serialize(), function(data) {
             if (typeof data.success != 'undefined') {
diff --git a/js/tbl_select.js b/js/tbl_select.js
index 88acefff5..8115245cb 100644
--- a/js/tbl_select.js
+++ b/js/tbl_select.js
@@ -60,10 +60,7 @@ $(document).ready(function() {
         $("#sqlqueryresults").empty();
         var msgbox = PMA_ajaxShowMessage(PMA_messages['strSearching']);
 
-	    // add this hidden field just once 
-	    if (! $search_form.find('input:hidden').is('#ajax_request_hidden')) {
-        	$search_form.append('<input type="hidden" id="ajax_request_hidden" name="ajax_request" value="true" />');
-	    }
+        PMA_prepareForAjaxRequest($search_form);
 
         $.post($search_form.attr('action'), $search_form.serialize(), function(response) {
             if (typeof response == 'string') {