if(document.getElementById('relative'))document.getElementById('relative').innerHTML='<div>前一篇：<a href=\"/other/chem_knowledge/show.asp?id=140750\" target=\"_self\">石油化工基础知识</a></div>\n<div>后一篇：<a href=\"/other/chem_knowledge/show.asp?id=143713\" target=\"_self\">英国石油状况简介</a></div>\n';