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/2007-12/4653">特约教师&nbsp;刘海燕 </a>  下一篇：<a href="/News/2007-12/4672">高考化学常见题型解题技巧 </a> ';
}