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/2012-5/48758">高中化学新人教版选修5（课件+学案）汇总 </a>  下一篇：<a href="/News/2012-5/48760">高中化学第四章新人教版选修5（课件+测试+学案）12套 </a> ';
}