Update threadscroll.js

Made compatible for use with additional_javascripts.

js/threadscroll.js

@@ -1,12 +1,13 @@
-var hoverElem = null;
+if(active_page == "index" || active_page == "ukko"){
+	var hoverElem = null;
 	
-$(document).mouseover(function(e){
+	$(document).mouseover(function(e){
 		var x = e.clientX, y = e.clientY,
 			elementOnMouseOver = document.elementFromPoint(x, y);
 			hoverElem = $(elementOnMouseOver);
-});
+	});
 	
-$(document).keydown(function(e){
+	$(document).keydown(function(e){
 		//Up arrow
 		if(e.which == 38){
 			var ele = hoverElem;
@@ -32,4 +33,5 @@ $(document).keydown(function(e){
 				}
 			}
 		}
-});
+	});
+}