before_after.js in pageflow-before-after-1.3.0

- old
+ new

@@ -30,10 +30,15 @@
 
   prepare: function(pageElement, configuration) {
   },
 
   resize: function(pageElement, configuration) {
-    pageElement.find(".before_after").before_after("refresh");
+    var beforeAfterElement = pageElement.find('.before_after');
+
+    if (beforeAfterElement.before_after('instance')) {
+      beforeAfterElement.before_after('refresh');
+    }
+
     pageElement.find('.scroller').scroller("refresh");
   },
 
   preload: function(pageElement, configuration) {
     return pageflow.preload.backgroundImage(pageElement.find('.background_image'));