if(document.getElementById('relative'))document.getElementById('relative').innerHTML='<div>前一篇：<a href=\"/other/chem_knowledge/show.asp?id=194005\" target=\"_self\">什么是信用证</a></div>\n<div>后一篇：<a href=\"/other/chem_knowledge/show.asp?id=198412\" target=\"_self\">危险化学品的标准分类</a></div>\n';