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/2010-2/18191">2010高三化学知识点详解大全：化学实验 </a>  下一篇：<a href="/News/2010-2/18193">2010届高三化学一轮考点精讲精析：化学实验 </a> ';
}