Example code clean up.

examples/webgl_trails.html

@@ -26,19 +26,14 @@
 
 			var camera, scene, renderer;
 
-			var mesh, zmesh, lightMesh, geometry;
-
 			var mouseX = 0, mouseY = 0;
 
 			var windowHalfX = window.innerWidth / 2;
 			var windowHalfY = window.innerHeight / 2;
 
-			document.addEventListener( 'mousemove', onDocumentMouseMove, false );
-
 			init();
 			animate();
 
-
 			function init() {
 
 				container = document.createElement( 'div' );
@@ -84,6 +79,8 @@
 
 				//
 
+				document.addEventListener( 'mousemove', onDocumentMouseMove, false );
+
 				window.addEventListener( 'resize', onWindowResize, false );
 
 			}