function chg(id, clsof) {
	if (navigator.appVersion > "3") {
		cls = document.getElementById(id).className; /* 現状のclsを取得 */
		if( clsof == 0 ){ /* マウスオフになったとき、現状のclsからonを引いたものをclsとする */
			onid = cls.indexOf("on", 0);
			cls = cls.substr(0, onid);
		}else if( clsof == 1 ){ /* マウスオンになったとき、現状のclsにonを足したものをclsとする */
			cls = cls+"on";
		}
		document.getElementById(id).className = cls; /* 新しいclsを代入 */
	}
}

function unv(imgname,imgof) {
	if (navigator.appVersion > "3") {
		imgnum = new Image();
		if(  imgof == 0 ){
			imgnum.src = "../img/unv/img_"+imgname+".gif";
		}else if( imgof == 1 ){
			imgnum.src = "../img/unv/img_"+imgname+"_on.gif";
		}else if(  imgof == 2 ){
			imgnum.src = "/img/unv/img_"+imgname+".gif";
		}else if( imgof == 3 ){
			imgnum.src = "/img/unv/img_"+imgname+"_on.gif";
		}

		document.images[imgname].src = imgnum.src;
	}
}

function tnv(imgname,imgof) {
	if (navigator.appVersion > "3") {
		imgnum = new Image();
		if(  imgof == 0 ){
			imgnum.src = "img/top/img_"+imgname+".jpg";
		}else if( imgof == 1 ){
			imgnum.src = "img/top/img_"+imgname+"_on.jpg";
		}
		document.images[imgname].src = imgnum.src;
	}
}


function entbtn(imgname,imgof) {
	if (navigator.appVersion > "3") {
		imgnum = new Image();
		if(  imgof == 0 ){
			imgnum.src = "img/btn_contact.jpg";
		}else if( imgof == 1 ){
			imgnum.src = "img/btn_contact_on.jpg";
		}
		document.images[imgname].src = imgnum.src;
	}
}

function chgimg(imgname,imgof) {
	if (navigator.appVersion > "3") {
		imgnum = new Image();
		if(  imgof == 0 ){
			imgnum.src = "img/img_"+imgname+".jpg";
		}else if( imgof == 1 ){
			imgnum.src = "img/img_"+imgname+"_on.jpg";
		}
		document.images[imgname].src = imgnum.src;
	}
}