 For scenes where the chipmunks interacted with props, some of them were live-action props while others, such as a paper airplane, were produced and animated with computers.The first poster for "Alvin and the Chipmunks" was revealed online on July 4, 2007.Later that month, Fox launched the official website for "Alvin and the Chipmunks" with only a trailer and synopsis; Several games were added later on.