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/2019-8/176645">2019-2020版数学新指导人教A版选修2-1课件+练习 </a>  下一篇：<a href="/News/2019-8/176647">2019-2020学年新素养导学化学选修五鲁科版课件+文档 </a> ';
}