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/2018-1/156776">高中化学素材集锦 </a>  下一篇：<a href="/News/2018-1/156778">高中语文写作 对点讲义 </a> ';
}