function show(a,b) {
var bannerNumber = 12;
for (i=1;i<=bannerNumber;i++){
	if (i % 2 === 0 ){
		var item=document.getElementById(i);
		if (item){
			item.style.display = 'none'; 
		}
	}else{
		var item=document.getElementById(i);
		if (item){
			item.style.display = 'block'; 
		}
	}
}
d=document.getElementById(a);
d.style.display = "none";
e=document.getElementById(b);
e.style.display = "block";
}