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/2013-1/61380">2013届高三物理二轮总复习资料 </a>  下一篇：<a href="/News/2013-1/61382">2013版高二数学人教B版选修2-2同步练习 </a> ';
}