diff --git a/templates/books_for_series.html b/templates/books_for_series.html
index 451b0fe..f56442d 100644
--- a/templates/books_for_series.html
+++ b/templates/books_for_series.html
@@ -42,7 +42,7 @@
 				{% if not book.child_ref|length %}
 					{{ SeriesBookNum( s.id, book.id ) }} of <a href="/series/{{s.id}}">{{s.title}}</a><br>
 				{% endif %}
-				{% if SeriesBookNum( s.id, book.id ) == 1 %}
+				{% if SeriesBookNum( series.id, book.id ) == 1 %}
 					<script>
 						{% if book.parent_ref|length %}
 							$('#up-{{book.parent_ref[0].book_id}}').addClass("disabled")
@@ -51,7 +51,7 @@
 						{% endif %}
 					</script>
 				{% endif %}
-				{% if SeriesBookNum( s.id, book.id ) == s.num_books %} 
+				{% if SeriesBookNum( series.id, book.id ) == series.num_books %} 
 					<script>
 						{% if book.parent_ref|length %}
 							$('#down-{{book.parent_ref[0].book_id}}').addClass("disabled")