browserName = navigator.appName.charAt(0);
browserVer = navigator.appVersion.charAt(0);

	if (browserVer >= 3) {
		hajimeni_on = new Image();
		hajimeni_on.src = "../img/navi_hajimeni_d.gif";
		hajimeni_off = new Image();
		hajimeni_off.src = "../img/navi_hajimeni_n.gif";
		//
		tokushoku_on = new Image();
		tokushoku_on.src = "../img/navi_tokushoku_d.gif";
		tokushoku_off = new Image();
		tokushoku_off.src = "../img/navi_tokushoku_n.gif";
		//
		hoikunaiyo_on = new Image();
		hoikunaiyo_on.src = "../img/navi_hoikunaiyo_d.gif";
		hoikunaiyo_off = new Image();
		hoikunaiyo_off.src = "../img/navi_hoikunaiyo_n.gif";
		//
		azukarihoiku_on = new Image();
		azukarihoiku_on.src = "../img/navi_azukarihoiku_d.gif";
		azukarihoiku_off = new Image();
		azukarihoiku_off.src = "../img/navi_azukarihoiku_n.gif";
		//
		junior_school_on = new Image();
		junior_school_on.src = "../img/navi_junior_school_d.gif";
		junior_school_off = new Image();
		junior_school_off.src = "../img/navi_junior_school_n.gif";
		//
		youjicenter_on = new Image();
		youjicenter_on.src = "../img/navi_center_g.gif";
		youjicenter_off = new Image();
		youjicenter_off.src = "../img/navi_center_n.gif";
		//
		nenkangyoji_on = new Image();
		nenkangyoji_on.src = "../img/navi_nenkangyoji_d.gif";
		nenkangyoji_off = new Image();
		nenkangyoji_off.src = "../img/navi_nenkangyoji_n.gif";
		//
		jugyofukei_on = new Image();
		jugyofukei_on.src = "../img/navi_jugyofukei_d.gif";
		jugyofukei_off = new Image();
		jugyofukei_off.src = "../img/navi_jugyofukei_n.gif";
		//
		asobiba_on = new Image();
		asobiba_on.src = "../img/navi_asobiba_d.gif";
		asobiba_off = new Image();
		asobiba_off.src = "../img/navi_asobiba_n.gif";
		//
		nyuenannai_on = new Image();
		nyuenannai_on.src = "../img/navi_nyuenannai_d.gif";
		nyuenannai_off = new Image();
		nyuenannai_off.src = "../img/navi_nyuenannai_n.gif";
		//
		univ_on = new Image();
		univ_on.src = "../img/navi_univ_d.gif";
		univ_off = new Image();
		univ_off.src = "../img/navi_univ_n.gif";
		//
	}

function actOn(imgName)  {
	if (browserVer >= 4)   {
		onImg = eval(imgName + "_on.src");
		document [imgName].src = onImg;
	}
}

function actOff(imgName) {
	if (browserVer >= 4)   {
		offImg = eval(imgName + "_off.src");
		document [imgName].src = offImg;
	}
}