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/2020-7/187485">2020-2021学年高中生物人教版选修3课件汇总 </a>  下一篇：<a href="/News/2020-7/187487">2020-2021学年高中生物人教版必修1习题汇总 </a> ';
}