使用CSS Sprite技术，利用一个初始图片和一张画满各个动作的拼接图片，从而实现了动画效果。

首先，需要两张图，分别是：

　　当有这两张图后，我们就可以开始模拟了。

　　我先通过firebug观察，发现google首页在运行的时候会循环加载以下html代码：

<div id="hplogo0" style="left:307px;top:48px;width:88px;height:89px;background:url(http://www.google.com.hk/logos/2011/graham11-hp-sprite.png) no-repeat scroll 0px 0px transparent;"></div> <div id="hplogo1" style="left:307px;top:48px;width:89px;height:89px;background:url(http://www.google.com.hk/logos/2011/graham11-hp-sprite.png) no-repeat scroll -88px 0px transparent;"></div> <div id="hplogo2" style="left:307px;top:48px;width:91px;height:89px;background:url(http://www.google.com.hk/logos/2011/graham11-hp-sprite.png) no-repeat scroll -177px 0px transparent;"></div> <div id="hplogo3" style="left:305px;top:49px;width:93px;height:89px;background:url(http://www.google.com.hk/logos/2011/graham11-hp-sprite.png) no-repeat scroll -268px 0px transparent;"></div> <div id="hplogo4" style="left:305px;top:50px;width:93px;height:88px;background:url(http://www.google.com.hk/logos/2011/graham11-hp-sprite.png) no-repeat scroll -361px 0px transparent;"></div> <div id="hplogo5" style="left:305px;top:50px;width:93px;height:88px;background:url(http://www.google.com.hk/logos/2011/graham11-hp-sprite.png) no-repeat scroll -454px 0px transparent;"></div> <div id="hplogo6" style="left:306px;top:52px;width:92px;height:86px;background:url(http://www.google.com.hk/logos/2011/graham11-hp-sprite.png) no-repeat scroll -547px 0px transparent;"></div> <div id="hplogo7" style="left:305px;top:53px;width:93px;height:84px;background:url(http://www.google.com.hk/logos/2011/graham11-hp-sprite.png) no-repeat scroll -639px 0px transparent;"></div> <div id="hplogo8" style="left:305px;top:54px;width:94px;height:83px;background:url(http://www.google.com.hk/logos/2011/graham11-hp-sprite.png) no-repeat scroll -732px 0px transparent;"></div> <div id="hplogo9" style="left:306px;top:54px;width:93px;height:83px;background:url(http://www.google.com.hk/logos/2011/graham11-hp-sprite.png) no-repeat scroll -826px 0px transparent;"></div> <div id="hplogo10" style="left:307px;top:54px;width:92px;height:83px;background:url(http://www.google.com.hk/logos/2011/graham11-hp-sprite.png) no-repeat scroll -919px 0px transparent;"></div> <div id="hplogo11" style="le