if(document.getElementById('relative'))document.getElementById('relative').innerHTML='<div>前一篇：<a href=\"/other/chem_knowledge/show.asp?id=591982\" target=\"_self\">石油百科：怎么从重油里变出汽油</a></div>\n<div>后一篇：<a href=\"/other/chem_knowledge/show.asp?id=593254\" target=\"_self\">汽油产品基本知识</a></div>\n';