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/2017-12/154590">2017-2018学年高中历史人教版必修二课件 </a>  下一篇：<a href="/News/2017-12/154592">2017-2018学年高中人教版英语必修一课件 </a> ';
}