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/2021-4/197240">2020-2021学年高一物理教科版必修2教学课件 </a>  下一篇：<a href="/News/2021-4/197242">新教材2020-2021学年高一历史部编版必修下册教学课件 </a> ';
}