diff --git a/12/index.html b/12/index.html
index de4ef8e..0f9bf42 100644
--- a/12/index.html
+++ b/12/index.html
@@ -282,7 +282,7 @@
          
             document.querySelector("#implicancies_05 .etherpadlink").addEventListener("click",function(e){
                 console.log("click", e);
-              	if(document.querySelector("#implicancies_05 .etherpad_iframe").parentNode.classList.has("hidden")){
+              	if(document.querySelector("#implicancies_05 .etherpad_iframe").parentNode.classList.contains("hidden")){
                 	document.querySelector("#implicancies_05 .etherpad_iframe").parentNode.classList.remove("hidden");  
                 }else{ 
                   	document.querySelector("#implicancies_05 .etherpad_iframe").parentNode.classList.add("hidden");