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/2010-3/18947">备战2010高考之《染色体变异》学案汇编 </a>  下一篇：<a href="/News/2010-3/18949">2010届高三数学知识点复习 </a> ';
}