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/2018-8/166120">2018苏教版化学选修五同步练习+学案 </a>  下一篇：<a href="/News/2018-8/166122">2018年高中北师大版数学必修二课件 </a> ';
}