function chkdiv(divid){
	var chkid=document.getElementById(divid);
	if(chkid != null){return true; }
	else {return false; }	
}
if (chkdiv('fy')){
	document.getElementById('fy').innerHTML='上一篇：<a href="/News/2020-1/182680">2019-2020学人教版化学必修二导学同步课件+作业 </a>  下一篇：<a href="/News/2020-1/182682">2019-2020学年北师大版数学必修二导学同步课件+课时作业 </a> ';
}