diff --git a/hierarchical_select.module b/hierarchical_select.module
index 731267d..7b80b0a 100644
--- a/hierarchical_select.module
+++ b/hierarchical_select.module
@@ -358,6 +358,10 @@ function _hs_process_determine_hsid($element, &$form_state) {
   else {
     $hsid = check_plain($element['#value']['hsid']);
   }
+  
+  $last_hsid = drupal_array_get_nested_value($form_state, array('storage', 'hs', 'last_hsid'));
+  if ($last_hsid <= $hsid)
+    $form_state['storage']['hs']['last_hsid'] = $hsid;
 
   return $hsid;
 }
@@ -689,14 +693,19 @@ function _hs_process_render_nojs($element, $config) {
 /**
  * Hierarchical select form element type #process callback.
  */
-function form_hierarchical_select_process($element, &$form_state, $complete_form) {  
-  // dpm('#process');
-  // dpm($form_state);
-  //
-  // Calculations.
-  //
-
-  // Determine the HSID.
+function form_hierarchical_select_process($element, &$form_state, $complete_form) {
+ 	if(arg(0) != 'hierarchical_select_ajax') {  //@TODO: verify if we have AJAX call
+ 		$cid = isset($element['#parents']) ? implode("-",$element['#parents']) : implode("-",$element['#field_parents']); //Get unique identifier using parents of the field
+ 		$elhsid = drupal_array_get_nested_value($element, array('#value', 'hsid')); // verify if hsid is present or not
+ 		if (!isset($elhsid)) {
+ 			$cached = drupal_array_get_nested_value($form_state, array('storage', 'hs', 'hs_fields', $cid));	//retrieve previous element from form_state	
+ 		}
+ 		if (empty($cached))
+ 			$docache = TRUE;
+ 		else
+ 			return $cached;  //switch courrent element with the "cached" one))
+ 	}
+ 	// Determine the HSID.
   $hsid = _hs_process_determine_hsid($element, $form_state);
 
   // Config.
@@ -812,6 +821,9 @@ function form_hierarchical_select_process($element, &$form_state, $complete_form
   // Send the collected developer mode logs (by using #attached JS).
   $element = _hs_process_developer_mode_send_log_js($element, $hsid);
 
+  if (!empty($docache))
+    $form_state['storage']['hs']['hs_fields'][$cid] = $element; //store new element in cache
+
   return $element;
 }