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/2020-1/181766">2019-2020学年新培优北师大版同步数学选修2-3课件+练习 </a>  下一篇：<a href="/News/2020-1/181768">2019-2020学年新培优同步北师大版数学选修2-1课件+检测 </a> ';
}