function MouseOverImagePair( out_filename, over_filename ) {
	this.out = new Image();
	this.over = new Image();
	this.out.src = out_filename;
	this.over.src = over_filename;
}
		
function MouseOverManager(doc) {
	this.doc = doc;
	this.imgs = new Array();
	
	this.addImage = function( img_name, out_filename, over_filename ) {
		this.imgs[img_name] = new MouseOverImagePair(out_filename, over_filename);
	}
	
	this.mouseOver = function( img_name ) {
		this.doc[img_name].src = this.imgs[img_name].over.src;
	}
	
	this.mouseOut = function( img_name ) {
		this.doc[img_name].src = this.imgs[img_name].out.src;
	}
}