diff -u a/jquery_expander.module b/jquery_expander.module
--- a/jquery_expander.module	2012-11-19 11:50:51.000000000 +0200
+++ b/jquery_expander.module	2014-06-04 13:53:44.680647517 +0300
@@ -21,6 +21,8 @@
         'slicePoint' => 50,
         'userCollapseText' => t('Collapse'),
         'userCollapsePrefix' => '',
+        'expandEffect' => 'fadeIn',
+        'collapseEffect' => 'fadeOut',
       ),
     ),
   );
@@ -49,6 +51,17 @@
     '#default_value' => $settings['expandPrefix'],
   );
 
+  $element['expandEffect'] = array(
+    '#type' => 'select',
+    '#title' => t('Expand effect'),
+    '#default_value' => $settings['expandEffect'], //variable_get('plugin1', true),
+    '#options' => array(
+      'slideDown' => t('Slide Down'),
+      'fadeIn' => t('Fade In'),
+    ),
+    '#description' => t("Select an effect to use when expand."),
+  );
+
   $element['slicePoint'] = array(
     '#type' => 'textfield',
     '#title' => t('Slice point'),
@@ -79,6 +92,17 @@
     '#default_value' => $settings['userCollapsePrefix'],
   );
 
+  $element['collapseEffect'] = array(
+    '#type' => 'select',
+    '#title' => t('Collapse effect'),
+    '#default_value' => $settings['collapseEffect'], //variable_get('plugin1', true),
+    '#options' => array(
+      'slideUp' => t('Slide Up'),
+      'fadeOut' => t('Fade Out'),
+    ),
+    '#description' => t("Select an effect to use when collapse."),
+  );
+
   return $element;
 }
 
Common subdirectories: a/js and b/js