diff -Naur a/date_single_day.module b/date_single_day.module
--- a/date_single_day.module	2010-05-26 23:21:05.000000000 +0300
+++ b/date_single_day.module	2010-08-24 00:01:31.987196563 +0300
@@ -59,7 +59,22 @@
         }
       }
     }
-  }  
+  } else if ($form_id == 'content_add_more_js') {
+	  foreach ($form as $field_name => $field){
+		  foreach (array_keys($form[$field_name]) as $key) {
+			  if (is_numeric($key)) {
+				  if ( isset($form[$field_name][$key]['#type']) && in_array($form[$field_name][$key]['#type'] , array('date_popup'))){
+
+					  $ct_fields = content_fields(NULL, $form[$field_name][$key]['#type']);
+                      if (!empty($ct_fields[$field_name]['widget']['single_day'])) {
+					  	$form[$field_name][$key]['#after_build'][] = 'date_single_day_after_build';
+					  	$form[$field_name][$key]['#theme'][] = 'date_single_day_element';
+					  }
+				  }
+			  }
+		  }
+	  }
+  }
 }
 
 /**