diff --git a/demo/biyadi/images/page3_bg.jpg b/demo/biyadi/images/page3_bg.jpg
deleted file mode 100644
index dced73e..0000000
Binary files a/demo/biyadi/images/page3_bg.jpg and /dev/null differ
diff --git a/demo/biyadi/index.html b/demo/biyadi/index.html
index c1ef6f1..2af938a 100644
--- a/demo/biyadi/index.html
+++ b/demo/biyadi/index.html
@@ -105,7 +105,6 @@ var imgs = [
   './images/page2_car.png',
   './images/page2_char_lar.png',
   './images/page2_rect.png',
-  './images/page3_bg.jpg',
   './images/page3_char_lar.png',
   './images/page3_person.png',
   './images/page4_char.png',
@@ -417,7 +416,7 @@ function render() {
 
   var page3Stage = new C3D.Stage()
   page3Stage.size(window.innerWidth, window.innerHeight).position(0, 0, 0).material({
-    image: './images/page3_bg.jpg'
+    image: './images/page5_bg.jpg'
   }).update()
 
   var page3 = new C3D.Plane()
@@ -483,7 +482,7 @@ function render() {
 
   var page4Stage = new C3D.Stage()
   page4Stage.size(window.innerWidth, window.innerHeight).position(0, 0, 0).material({
-    image: './images/page1_bg.jpg'
+    image: './images/page5_bg.jpg'
   }).update()
 
   var page4 = new C3D.Plane()