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) {
		item01On = new Image();
		item01On.src = "top_img/item01_over.jpg";
		item02On = new Image();
		item02On.src = "top_img/item02_over.jpg";
		item03On = new Image();
		item03On.src = "top_img/item03_over.jpg";
		item04On = new Image();
		item04On.src = "top_img/item04_over.jpg";
		item05On = new Image();
		item05On.src = "top_img/item05_over.jpg";
		item06On = new Image();
		item06On.src = "top_img/item06_over.jpg";
		item07On = new Image();
		item07On.src = "top_img/item07_over.jpg";
		item08On = new Image();
		item08On.src = "top_img/item08_over.jpg";

		item01Off = new Image();
		item01Off.src = "top_img/item01.jpg";
		item02Off = new Image();
		item02Off.src = "top_img/item02.jpg";
		item03Off = new Image();
		item03Off.src = "top_img/item03.jpg";
		item04Off = new Image();
		item04Off.src = "top_img/item04.jpg";
		item05Off = new Image();
		item05Off.src = "top_img/item05.jpg";
		item06Off = new Image();
		item06Off.src = "top_img/item06.jpg";
		item07Off = new Image();
		item07Off.src = "top_img/item07.jpg";
		item08Off = new Image();
		item08Off.src = "top_img/item08.jpg";

		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();
}