* h1

index.html

@@ -185,7 +185,7 @@
 	<div class="container">
 		<div style="padding: 80px 150px 0; height: 160px;">
 			<a class="logo" href="https://github.com/RubaXa/Sortable"><img src="st/logo.png"/></a>
-			<h1 class="layer" data-force="40" data-force-y="2.5">The JavaScript library for modern browsers and touch devices. No&nbsp;jQuery.</h1>
+			<h1 data-force="40" data-force-y="2.5">The JavaScript library for modern browsers and touch devices. No&nbsp;jQuery.</h1>
 		</div>
 	</div>
 
@@ -378,6 +378,7 @@ sort.destroy();
 				y = evt.clientY;
 			}, false);
 
+
 			document.addEventListener('mousemove', function (evt){
 				x = evt.clientX;
 				y = evt.clientY;
@@ -385,6 +386,7 @@ sort.destroy();
 
 
 			(function _loop(){
+				if( x && y ){
 					var winWidth = window.innerWidth;
 					var winHeight = window.innerHeight;
 					var halfWidth = winWidth / 2;
@@ -401,6 +403,7 @@ sort.destroy();
 					});
 
 					requestAnimationFrame(_loop);
+				}
 			})();
 		})();
 	</script>