function ini() {
	document.getElementById("contents01").style.display = "block";
	document.getElementById("contents02").style.display = "none";
	document.getElementById("contents03").style.display = "none";
	document.getElementById("contents04").style.display = "none";
	document.getElementById("contents05").style.display = "none";
	
}

function btn(sel,btn) {
	document.getElementById("contents01").style.display = "none";
	document.getElementById("contents02").style.display = "none";
	document.getElementById("contents03").style.display = "none";
	document.getElementById("contents04").style.display = "none";
	document.getElementById("contents05").style.display = "none";
	
	//クリックされたボタンに対応したブロックを表示
	document.getElementById(sel).style.display = "block";
}