// menu
function show(btn,name,num,total,off,on){
	        var btn=btn;
			var total=total;
			var num=num;
			var name=name;
			var off=off;
			var on=on;
	        var b = document.getElementsByTagName("*")
			for (i=1; i<=total; i++){
			b[name+i].style.display="none";
			b[btn+i].className=off;
				if (i==num){
				b[name+i].style.display="block";
				b[btn+i].className=on;
				}
			}
}