function swapImageOff(imgName) {
	if (document.images) {
		document[imgName].src = eval(imgName + "_Off.src");
		document[imgName].src = previous_img;
		previous_img = "";
	}
}

function swapImageOn(imgName) {
	if (document.images) {
		previous_img = document[imgName].src;
		document[imgName].src = eval(imgName + "_On.src");
	}
}

navPreLoaded = false;
imageBox = new Object();

function PreLoad() {
}

function ImageOn (name,tabFlag) {
	if (!navPreLoaded) return;
	if (!tabFlag) document.images[name].src = imageBox.btn[name]['on'].src;
}

function ImageOff (name,tabFlag) {
	if (!navPreLoaded) return;
	if (!tabFlag) document.images[name].src = imageBox.btn[name]['off'].src;
}