var PX_REFERER = (document.referrer == null) ? "" : document.referrer;
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var PX_KEYWORDS = "";
var PX_METAS = document.getElementsByTagName("META");
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var openx_key = /^[^\_\-\s]*?(币|贝|通宝|元宝|重宝)/;
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+ "&amp;keywords=" + encodeURIComponent(PX_KEYWORDS.substring(0,50))
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document.write(PX_STRING);