背景图片切换

bjqh.js

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	core.type = 'text/javascript'; core.async = true; 
	core.src = 'https://gist.github.com/ccbikai/5802471/raw/42ad24c950425b2f7d2ee258629258976518e3a9/base.js';
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	s.appendChild(core);
	var bgimg = [
	 "http://pic.winysky.com/content/uploads/bg/0.jpg",
      "http://pic.winysky.com/content/uploads/bg/1.jpg",
       "http://pic.winysky.com/content/uploads/bg/2.jpg",
        "http://pic.winysky.com/content/uploads/bg/3.jpg",
         "http://pic.winysky.com/content/uploads/bg/4.jpg",
          "http://pic.winysky.com/content/uploads/bg/5.jpg",
           "http://pic.winysky.com/content/uploads/bg/6.jpg",
            "http://pic.winysky.com/content/uploads/bg/7.jpg",
             "http://pic.winysky.com/content/uploads/bg/8.jpg",
              "http://pic.winysky.com/content/uploads/bg/9.jpg",
               "http://pic.winysky.com/content/uploads/bg/10.jpg",
                "http://pic.winysky.com/content/uploads/bg/11.jpg",
                 "http://pic.winysky.com/content/uploads/bg/12.jpg"
      ];
	  bgimg.sort(function(){return Math.random()>0.5?-1:1;});
	  
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