diff --git a/script/gallery.js b/script/gallery.js
index 836c711..47da313 100644
--- a/script/gallery.js
+++ b/script/gallery.js
@@ -50,7 +50,7 @@ function converseId(id) {
   }
 }
 
-function toggle(checkbox, thisSet, thatSet) {
+function toggle(checkbox) {
   if (checkbox.checked)
     document.getElementById(converseId(checkbox.id)).checked = false;