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/2021-7/199828">新教材2021-2022学年北师大版数学必修第二册课后落实 </a>  下一篇：<a href="/News/2021-7/199830">新教材2021-2022学年北师大版数学必修第二册课件 </a> ';
}