var s=1;
var t=10000;//循环周期(1秒)
var timer;
function changeMc(x,y){
// x是当前显示的层 y是即将显示的层
 clearTimeout(timer);
 if (x!=y){
 document.getElementById('yp_card'+x).style.display = "none";
 document.getElementById('yp_card'+y).style.display = "block";
 s=y
 }
}
function hi(){
timer=setTimeout("sh()",t)
}
function sh(){
	s=(s>=1)?1:s+1
	for (var i=1;i<=1;i++){
		document.getElementById("yp_card"+i).style.display = "none";
	}
	document.getElementById("yp_card"+s).style.display = "block"
	timer=setTimeout("sh()",t)
}
sh()