function rollov(btn){
	var obj = document.getElementById(btn);
				var num = btn.charAt(4);
				obj.style.display= "block";
				for(i=0;i>=9;i++){
					if(i!=num){
						document.getElementById["mapb"+i].style.display= "none";
					}
				}
}

function rollout(btn){
	var obj = document.getElementById(btn);
		obj.style.display= "none";
}