rem: z.step(from, to); }, 13); 
add: z.step(from, to); }, 13); 
context: 		z.timer = setInterval(function(){			z.step(from, to);		}, 13);
meta: 2798	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/2798/9477c418dbf50f2341dec7c02f60ab3d77da5378/fx.js/buggy/fx/fx.js