function large() {
	document.body.style.fontSize = "15px";
	document.getElementById("nav1").className = "nav1";
	document.getElementById("nav2").className = "nav2";
	document.getElementById("nav3").className = "nav3_ac";
}
function middle() { 
	document.body.style.fontSize = "13px";
	document.getElementById("nav1").className = "nav1";
	document.getElementById("nav2").className = "nav2_ac";
	document.getElementById("nav3").className = "nav3";
}
function small() {
	document.body.style.fontSize = "10.5px";
	document.getElementById("nav1").className = "nav1_ac";
	document.getElementById("nav2").className = "nav2";
	document.getElementById("nav3").className = "nav3";
}




function hintOver(num) {
	//alert(document.getElementById("hint_flg").value);
	flg = document.getElementById("hint_flg").value;
	if (flg=="0") {
		document.getElementById("hint_view" + num).style.display="block";
		document.getElementById("hint_flg").value = "1";
	} else {
		document.getElementById("hint_view" + num).style.display="none";
		document.getElementById("hint_flg").value = "0";
	}
}
function hintOut(num) {
	document.getElementById("hint_view" + num).style.display="none";
}


function gnaviOvert(num) {
	document.getElementById("fukidasi" + num).style.display="block";
}
function gnaviOut(num) {
	document.getElementById("fukidasi" + num).style.display="none";
}