// tab
function content_view(num){
	for(var i=1; i<=3; i++){
		var move = document.getElementById("content"+i);
		if(i==num){move.style.display = "block";
		}else{
		move.style.display = "none";
		}
	}
}

// tab
function content2_view(num){
	for(var i=1; i<=2; i++){
		var move = document.getElementById("content"+i);
		if(i==num){move.style.display = "block";
		}else{
		move.style.display = "none";
		}
	}
}

// tab
function multi_view(num){
	for(var i=1; i<=2; i++){
		var move = document.getElementById("multi"+i);
		if(i==num){move.style.display = "block";
		}else{
		move.style.display = "none";
		}
	}
}