Initial page based on Agency by http://startbootstrap.com

js/cbpAnimatedHeader.js

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+/**
+ * cbpAnimatedHeader.js v1.0.0
+ * http://www.codrops.com
+ *
+ * Licensed under the MIT license.
+ * http://www.opensource.org/licenses/mit-license.php
+ * 
+ * Copyright 2013, Codrops
+ * http://www.codrops.com
+ */
+var cbpAnimatedHeader = (function() {
+
+	var docElem = document.documentElement,
+		header = document.querySelector( '.navbar-fixed-top' ),
+		didScroll = false,
+		changeHeaderOn = 300;
+
+	function init() {
+		window.addEventListener( 'scroll', function( event ) {
+			if( !didScroll ) {
+				didScroll = true;
+				setTimeout( scrollPage, 250 );
+			}
+		}, false );
+	}
+
+	function scrollPage() {
+		var sy = scrollY();
+		if ( sy >= changeHeaderOn ) {
+			classie.add( header, 'navbar-shrink' );
+		}
+		else {
+			classie.remove( header, 'navbar-shrink' );
+		}
+		didScroll = false;
+	}
+
+	function scrollY() {
+		return window.pageYOffset || docElem.scrollTop;
+	}
+
+	init();
+
+})();