如图： 有时候弹，有时候又不弹。 浏览网址：http://www.darwindeng.com  求大神回复。

这个是弹窗代码，请帮忙分析一下。感谢。

<div id="m_shd_div" style="z-index: 10000; cursor: pointer; text-align: right; visibility: visible;"><a href="#" style="text-decoration:none;"><img src="http://js001.b0.upaiyun.com/shutdown.gif" onclick="window._as_pop.close()" height="11" width="11"></a></div><iframe marginwidth="0" marginheight="0" src="http://js001.b0.upaiyun.com/0822/d2.html?type=img&amp;adurl=http%3A%2F%2Fjs001.b0.upaiyun.com%2Fimages%2F1490261167333.jpg&amp;click=https%3A%2F%2Fwww.6798835.com%2Fgyl%2Fst2%2Fc.do%3Fct%3D229%26p%3D1564%26pe%3D2389%26ai%3D53567%26w%3D-22%26wp%3D15%26cot%3D0%26cos%3D0.8%26r%3Dhttp%3A%2F%2Fcps.kaola.com%2Fcps%2Flogin%3FunionId%3D532915%26uid%3DQKKJ1%26trackingCode%3D%26targetUrl%3Dhttp%253a%252f%252fwww.kaola.com%252f%253ftag%253da6c365bebec2e13cef8bd3e648a44a3c%2526__da_851a780a_56bac7efe9033c80&amp;ap=https%3A%2F%2Fwww.6798835.com%2Fgyl%2Fst2%2Fp.do%3Fct%3D229%26p%3D1564%26pe%3D2389%26ai%3D53567%26w%3D-22%26wp%3D15%26cot%3D0%26cos%3D0.8&amp;width=300&amp;height=250&amp;czid=1261545129" scrolling="auto" height="250" frameborder="0" width="100%"></iframe>