declare size as a local variable

examples/webgl_particles_random.html

@@ -46,7 +46,7 @@
 			if ( ! Detector.webgl ) Detector.addGetWebGLMessage();
 
 			var container, stats;
-			var camera, scene, renderer, particles, geometry, materials = [], parameters, i, h, color;
+			var camera, scene, renderer, particles, geometry, materials = [], parameters, i, h, color, size;
 			var mouseX = 0, mouseY = 0;
 
 			var windowHalfX = window.innerWidth / 2;