+/**
+ * Output JavaScript to toggle display of additional settings if avatars are disabled.
+ *
+ * @since 4.2.0
+ */
+function options_discussion_add_js() {
+?>
+ <script>
+ (function($){
+ var parent = $( '#show_avatars' ),
+ children = $( '.avatar-settings' );
+ parent.change(function(){
+ children.toggleClass( 'hide-if-js', ! this.checked );
+ });
+ })(jQuery);
+ </script>
+<?php
+}
+add_action( 'admin_print_footer_scripts', 'options_discussion_add_js' );
+