if(document.getElementById('relative'))document.getElementById('relative').innerHTML='<div>前一篇：<a href=\"/other/chem_knowledge/show.asp?id=322634\" target=\"_self\">柴油标号的分类</a></div>\n<div>后一篇：<a href=\"/other/chem_knowledge/show.asp?id=322639\" target=\"_self\">汽油</a></div>\n';