var curButton = '---';
var aImages = new Array(10);

function Images(org, swap) {
	if (document.images) {
		this.org = new Image();
		this.org.src = org;
		this.swap = new Image();
		this.swap.src = swap;
	}
}
function PreLoadButtons(name, ext, id) {
	aImages[id] = new Images(name+ext, name+"_on"+ext);
}
function BtDown(id) {
	if (id==curButton) {
		return;
	}
	if (document.images) {
		if (aImages[id].swap.complete) {
			document.images[id].src = aImages[id].swap.src;
		}
	}
}
function BtUp(id) {
	if (id==curButton) {
		return;
	}
	if (document.images) {
		if (aImages[id].org.complete) {
			document.images[id].src = aImages[id].org.src;
		}
	}
}
function GetCurButton() {
	return curButton;
}
function SetCurButton(id) {
	curButton = id;
}