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/2019-12/181323">2019-2020高中数学（人教A版）必修一、必修四课件+训练汇总 </a>  下一篇：<a href="/News/2019-12/181325">2019-2020学年北师大数学必修二、三课件+讲义+练习汇总 </a> ';
}