isIE = (navigator.appName == 'Microsoft Internet Explorer');
isV5 = (parseFloat(navigator.appVersion)>=5.0);

if (document.images) {
	rollOvers = 1;
} else {
	rollOvers = 0;
}

loaded = 0;

function loadImg() {
	if (rollOvers) {
		tab_eOn = new Image();
		tab_eOn.src = "http://www.miuraz.co.jp/en/common_img/tab_e_over.gif";
		tab_cOn = new Image();
		tab_cOn.src = "http://www.miuraz.co.jp/en/common_img/tab_c_over.gif";
		tab_jOn = new Image();
		tab_jOn.src = "http://www.miuraz.co.jp/en/common_img/tab_j_over.gif";
		glink01On = new Image();
		glink01On.src = "http://www.miuraz.co.jp/en/common_img/glink01_over.gif";
		glink02On = new Image();
		glink02On.src = "http://www.miuraz.co.jp/en/common_img/glink02_over.gif";
		glink03On = new Image();
		glink03On.src = "http://www.miuraz.co.jp/en/common_img/glink03_over.gif";
		glink04On = new Image();
		glink04On.src = "http://www.miuraz.co.jp/en/common_img/glink04_over.gif";

		tab_eOff = new Image();
		tab_eOff.src = "http://www.miuraz.co.jp/en/common_img/tab_e.gif";
		tab_cOff = new Image();
		tab_cOff.src = "http://www.miuraz.co.jp/en/common_img/tab_c.gif";
		tab_jOff = new Image();
		tab_jOff.src = "http://www.miuraz.co.jp/en/common_img/tab_j.gif";
		glink01Off = new Image();
		glink01Off.src = "http://www.miuraz.co.jp/en/common_img/glink01.gif";
		glink02Off = new Image();
		glink02Off.src = "http://www.miuraz.co.jp/en/common_img/glink02.gif";
		glink03Off = new Image();
		glink03Off.src = "http://www.miuraz.co.jp/en/common_img/glink03.gif";
		glink04Off = new Image();
		glink04Off.src = "http://www.miuraz.co.jp/en/common_img/glink04.gif";

		loaded = 1;
	}
}

function switchOn(imgName) {
	if (loaded == 1) {
		imgOn = eval(imgName+"On.src");
		document[imgName].src = imgOn;
	}
}

function switchOff(imgName) {
	if (loaded == 1) {
		imgOff = eval(imgName+"Off.src");
		document[imgName].src = imgOff;
	}
}

if (isIE || isV5) {
	loadImg();
}