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/2018-3/158516">2017-2018学年高中物理新人教版选修3-1习题 </a>  下一篇：<a href="/News/2018-3/158518">2018届高三英语大二轮复习文档 </a> ';
}