function top_show(n){
	if(n==1){
		document.getElementById("ts").className="ts_1";
		document.getElementById("ts_a").innerHTML='<img onmousedown="top_show(2)" src="/images/xingji2/ts_img_2.jpg" />';
		document.getElementById("ts_b").innerHTML='<img onmousedown="top_show(3)" src="/images/xingji2/ts_img_3.jpg" />';
	}
	else if(n==2){
		document.getElementById("ts").className="ts_2";
		document.getElementById("ts_a").innerHTML='<img onmousedown="top_show(3)" src="/images/xingji2/ts_img_3.jpg" />';
		document.getElementById("ts_b").innerHTML='<img onmousedown="top_show(1)" src="/images/xingji2/ts_img_1.jpg" />';
	}
	else{
		document.getElementById("ts").className="ts_3";
		document.getElementById("ts_a").innerHTML='<img onmousedown="top_show(1)" src="/images/xingji2/ts_img_1.jpg" />';
		document.getElementById("ts_b").innerHTML='<img onmousedown="top_show(2)" src="/images/xingji2/ts_img_2.jpg" />';
	}
	return false;
}