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/2020-10/189527">2020秋物理新教材人教版必修第一册课后作业 </a>  下一篇：<a href="/News/2020-10/189529">2020-2021学年高二物理人教版选修3-5学案 </a> ';
}