diff --git a/js/cs.js b/js/cs.js
index 46a482c..5900202 100644
--- a/js/cs.js
+++ b/js/cs.js
@@ -67,7 +67,8 @@ jQuery(document).ready(function($) {
 	var elementsToScan = [
 		'#comments',
 		'#site-navigation',
-		'article.page'
+		'article.page',
+		'#page-sidebar'
 		]
 	
 	$.each(elementsToScan, function(index, value){
@@ -269,7 +270,41 @@ function squareImg(img){
 	
 };
 
+/*
+	Filter Functionality for the A-Z Index
+	
+	The function will hide any text that does not match the filter input and remove letters
+	if there are no matches for that letter.
+*/
+	var filterEvent = null;
+	
+	$("#azFilterInput").keyup(function(){
+		azFilter();
+	});
+	
+	function azFilter(){
+		var filterInput = $("#azFilterInput").val();
+		
+		// Show everything that could have been hidden
+		$(".az-letter:hidden, .az-letter-list li:hidden").each(function(){
+			$(this).show();
+		});
+		
+		if(filterInput !== ""){
+			// Select any az-letter-page class where the text does not match the regular expression
+			$("a.az-letter-page").filter( function(i){ return $(this).html().match(new RegExp(filterInput, "i")) === null }).each(function(){
+				$(this).parent("li").hide();
+				var numberOfVisibleListItems = $(this).parents(".az-letter-list").children("li:visible").length;
+				
+				// If there are no visible list items for a letter than we will hide the whole div
+				if(numberOfVisibleListItems === 0){
+					$(this).parents(".az-letter").hide();
+				}
+			});
+		}
+	}
 
+/* ========================================= */
 
 $(document).ready(function(){
 	stickyFoot();
@@ -301,4 +336,4 @@ $(document).ready(function() {
     $('#uc-header .container').fadeIn('slow'); 
 });
 
-})
\ No newline at end of file
+});
\ No newline at end of file