diff --git a/frontend/web/assets/js/popo.js b/frontend/web/assets/js/popo.js
index 0884d4f..95602b3 100644
--- a/frontend/web/assets/js/popo.js
+++ b/frontend/web/assets/js/popo.js
@@ -5,11 +5,9 @@ $(function(){
         $(".model-bg").eq(0).removeClass("unchoose");
         $('.jump').removeClass('unchoose');
 
-        $('#side-menu .av').eq(0).click().addClass('boo');
+        $('#side-menu .av').eq(arr[0]).click().addClass('boo');
     });
 
-
-
     $(".model-bg").each(function (i) {
         let _that=$(this);
         _that.find(".nextPage").click(function () {
@@ -22,6 +20,8 @@ $(function(){
         _that.find(".Previous").click(function () {
             _that.addClass("unchoose");
             $(".model-bg").eq(i-1).removeClass("unchoose");
+            $('#side-menu .av').eq(arr[i]).addClass('boo');
+            $('#side-menu .av').eq(arr[i+1]).removeClass('boo');
         });
     });