diff --git a/static/aerbimJS.js b/static/aerbimJS.js
index be9853a..1e3d74b 100644
--- a/static/aerbimJS.js
+++ b/static/aerbimJS.js
@@ -322,20 +322,18 @@ function changeSlideProject (el,type) {
     if (dataset){
         let index_cur_slide = parseInt(dataset['indexSlideProj'])
         let count_slides = parseInt(dataset['countSlidesProj'])
-        let slide_f_processing = null
+        let new_index_slide = null
         if (type === 'next'){
-            if (!index_cur_slide + 1 > count_slides){
-                slide_f_processing = document.querySelector(`[data-index-slide-proj="${index_cur_slide++}"]`)
-            } else {
-                slide_f_processing = document.querySelector(`[data-index-slide-proj="1"]`)
-            }
+            new_index_slide = index_cur_slide + 1
         } else if (type === 'back'){
-            if (index_cur_slide - 1 !== 0){
-                slide_f_processing = document.querySelector(`[data-index-slide-proj="${index_cur_slide--}"]`)
-            } else {
-                slide_f_processing = document.querySelector(`[data-index-slide-proj="${count_slides}"]`)
-            }
+            new_index_slide = index_cur_slide - 1
         }
+        if (new_index_slide > count_slides){
+            new_index_slide = 1
+        } else if (new_index_slide < 1){
+            new_index_slide = count_slides
+        }
+        let slide_f_processing = document.querySelector(`[data-index-slide-proj="${new_index_slide}"]`)
         if (slide_f_processing){
             slide_f_processing.classList.toggle("show")
             slide_f_processing.classList.toggle("hide")