【摘抄】贴上一个段网上流行的图片切换功能——效果见右边导航中的【好书推荐】

什么也不说了，代码！！！！！

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img1 = new Image(); img1.src = 'http://images.cnblogs.com/cnblogs_com/OceanChen/172889/o_Design-Guidelines.png';
img2 = new Image(); img2.src = 'http://images.cnblogs.com/cnblogs_com/OceanChen/172889/o_ajaxinaction.jpg';
img3 = new Image(); img3.src = 'http://images.cnblogs.com/cnblogs_com/OceanChen/172889/o_linqbook.jpg';
img4 = new Image(); img4.src = 'http://images.cnblogs.com/cnblogs_com/OceanChen/172889/o_scotthabook.jpg';
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url1 = new Image(); url1.src = 'http://www.amazon.com/Framework-Design-Guidelines-Conventions-Development/dp/0321246756';
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url3 = new Image(); url3.src = 'http://www.amazon.com/gp/product/1933988169?ie=UTF8&tag=scoblo04-20&linkCode=xm2&camp=1789&creativeASIN=1933988169';
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url5 = new Image(); url5.src = 'http://www.amazon.com/gp/product/0596527578/002-5242737-1614454?ie=UTF8&tag=scoblo04-20&linkCode=xm2&camp=1789&creativeASIN=0596527578';
url6 = new Image(); url6.src = 'http://www.amazon.com/CLR-via-Second-Pro-Developer/dp/0735621632/ref=pd_sim_b_25';
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