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/2015-5/108348">一天一道高考数学题21 </a>  下一篇：<a href="/News/2015-5/108350">45个经典替换词，让你的作文脱胎换骨 </a> ';
}