diff --git a/static/js/Wiki.js b/static/js/Wiki.js
index 3cf34cc..51310a0 100644
--- a/static/js/Wiki.js
+++ b/static/js/Wiki.js
@@ -653,6 +653,9 @@ Wiki.prototype.make_image_button = function ( name, filename_prefix, handle_mous
 Wiki.prototype.down_image_button = function ( name ) {
   var button = getElement( name );
 
+  if ( /_down/.test( button.src ) )
+    return;
+
   if ( /_hover/.test( button.src ) )
     button.src = IMAGE_DIR + button.filename_prefix + "_button_down_hover.png";
   else
@@ -662,6 +665,9 @@ Wiki.prototype.down_image_button = function ( name ) {
 Wiki.prototype.up_image_button = function ( name ) {
   var button = getElement( name );
 
+  if ( !/_down/.test( button.src ) )
+    return;
+
   if ( /_hover/.test( button.src ) )
     button.src = IMAGE_DIR + button.filename_prefix + "_button_hover.png";
   else