if(document.getElementById('relative'))document.getElementById('relative').innerHTML='<div>前一篇：<a href=\"/other/chem_knowledge/show.asp?id=593255\" target=\"_self\">如何选用汽油的标号</a></div>\n<div>后一篇：<a href=\"/other/chem_knowledge/show.asp?id=593257\" target=\"_self\">柴油汽车保养与维修知识</a></div>\n';