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/2019-5/174863">2019英语新一线同步北师大必修四课件+讲义+精练 </a>  下一篇：<a href="/News/2019-5/174865">2018-2019学年高二下学期物理人教版选修3-4课件+练习 </a> ';
}