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/2017-7/146806">全优指导高中历史人民版选修4课件汇总 </a>  下一篇：<a href="/News/2017-7/146808">2018届高考数学（文）大一轮复习课时分层训练 </a> ';
}