diff --git a/layout.html b/layout.html
index be52765..87758f0 100755
--- a/layout.html
+++ b/layout.html
@@ -126,6 +126,7 @@ $(document).ready(function(){
 	$('.viewer')
 		.on('scroll', function(evt){
 			log('scroll...')
+			scroll_monitor()
 		})
 		.on('touchstart mousedown', function(evt){
 			log('touchstart...')