diff --git a/stepmania/Themes/default/Scripts/Actor.lua b/stepmania/Themes/default/Scripts/Actor.lua
new file mode 100644
index 0000000000..c638f2945d
--- /dev/null
+++ b/stepmania/Themes/default/Scripts/Actor.lua
@@ -0,0 +1,7 @@
+-- Hide if b is true, but don't unhide if b is false.
+function Actor:hide_if(b)
+	if b then
+		self:hidden(1)
+	end
+end
+