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) {
		submenu01On = new Image();
		submenu01On.src = "img/submenu01_over.gif";
		submenu02On = new Image();
		submenu02On.src = "img/submenu02_over.gif";
		submenu03On = new Image();
		submenu03On.src = "img/submenu03_over.gif";
		submenu04On = new Image();
		submenu04On.src = "img/submenu04_over.gif";
		submenu05On = new Image();
		submenu05On.src = "img/submenu05_over.gif";
		submenu06On = new Image();
		submenu06On.src = "img/submenu06_over.gif";
		submenu07On = new Image();
		submenu07On.src = "img/submenu07_over.gif";
		
		submenu01Off = new Image();
		submenu01Off.src = "img/submenu01.gif";
		submenu02Off = new Image();
		submenu02Off.src = "img/submenu02.gif";
		submenu03Off = new Image();
		submenu03Off.src = "img/submenu03.gif";
		submenu04Off = new Image();
		submenu04Off.src = "img/submenu04.gif";
		submenu05Off = new Image();
		submenu05Off.src = "img/submenu05.gif";
		submenu06Off = new Image();
		submenu06Off.src = "img/submenu06.gif";
		submenu07Off = new Image();
		submenu07Off.src = "img/submenu07.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();
}