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/2018-8/165258">高二苏教版化学选修4学案+同步练习汇总 </a>  下一篇：<a href="/News/2018-8/165260">2019届高考理科数学（人教版）一轮复习课件+练习 </a> ';
}