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/2020-12/192729">2020-2021物理新高考二轮复习作业 </a>  下一篇：<a href="/News/2020-12/192731">2020-2021高考政治二轮复习训练 </a> ';
}