Update threadscroll.js

Made compatible for use with additional_javascripts.

js/threadscroll.js

@@ -1,3 +1,4 @@
+if(active_page == "index" || active_page == "ukko"){
 	var hoverElem = null;
 	
 	$(document).mouseover(function(e){
@@ -33,3 +34,4 @@ $(document).keydown(function(e){
 			}
 		}
 	});
+}