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/2012-9/52848">对称问题分类探析 </a>  下一篇：<a href="/News/2012-9/52850">高考数学复习重点题型 </a> ';
}