diff --git a/static/aerbimJS.js b/static/aerbimJS.js
index b2c0239..0452b00 100644
--- a/static/aerbimJS.js
+++ b/static/aerbimJS.js
@@ -170,6 +170,11 @@ function change_slide (index_this_slide,type,list_lenght) {
     } else if (type === 'back'){
         new_index_slide = parseInt(index_this_slide) - 1
     }
+    if (parseInt(new_index_slide) > parseInt(list_lenght)){
+        new_index_slide = 1
+    } else if (parseInt(new_index_slide) < 1){
+        new_index_slide = list_lenght
+    }
     let slide_f_show = document.querySelector(`[data-id-slide="${new_index_slide}"]`)
     if (slide_f_show){
         slide_f_show.classList.toggle("show")
@@ -179,4 +184,5 @@ function change_slide (index_this_slide,type,list_lenght) {
 
         iterator_slide.innerHTML = `${new_index_slide} / ${list_lenght}`
     }
+
 }
\ No newline at end of file