function tabitshou(btn){
	for(i=0;i<8;i++){
		if(document.getElementById("divshou_"+i))
		{
			document.getElementById("divshou_"+i).className="shou_div_wei";
			document.getElementById("topshou_"+i).className = "dao_wei";
		}
	};
		document.getElementById("divshou_"+btn).className="shou_div_xuan";
		document.getElementById("topshou_"+btn).className = "dao_xuan";
		if (i>0)
		{
			btn1=btn-1
			document.getElementById("topshou_"+btn1).className = "dao_hou";
		}

};