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/2006-6/61">生物知识中的“先”和“后” </a>  下一篇：<a href="/News/2006-6/63">文综：关键在培养思维素质 </a> ';
}