xSwap = function(name){
	this.name = name;
	this.images = {};
	this.restoresrc = null;
	this.nest = "undefined";
};
xSwap.prototype.add = function(state,src){
	this.images[state] = new Image();
	this.images[state].src = src;
};
xSwap.prototype.swap = function(state){
	var img = this.getImage();
	this.restoresrc = img.src;
	img.src = this.images[state].src;
};
xSwap.prototype.restore = function(){
	if(this.restoresrc){
		this.getImage().src = this.restoresrc;
		this.restoresrc = null;
	}
};
xSwap.prototype.getImage = function(){// Private
	if(document.layers && this.nest == "undefined") this.nest = this.getLayer();
	if(document.layers && this.nest != false){
		return this.nest.document.images[this.name];
	}else{
		return document.images[this.name];
	}
};
xSwap.prototype.getLayer = function(root){// Private
	var i, k, layer, found = false;
	if(!root) root = window;
	for(i = 0; i < root.document.layers.length; i++){
		layer = root.document.layers[i];
		for(k = 0; k < layer.document.images.length; k++){
			if(layer.document.images[k].name == this.name){
				return layer;
			}
		}
		if(layer.document.layers.length) found = this.getLayer(layer);
		if(found) return found;
	}
	return false;
};