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/2017-8/147988">2017-2018学年高二化学人教版选修4课件汇总 </a>  下一篇：<a href="/News/2017-8/147990">2018届高考英语（译林版）总复习真题研练 </a> ';
}