function rand_ord(){
	return Math.round(Math.random())-0.5;
}

function slideshow_init(){
	img_object.rand_array = img_object.img_array.slice(0);
	img_object.rand_array.sort(rand_ord);

	img_object.cur_img = img_object.rand_array.pop();
	//(new Image()).src = img_object.img_pattern.replace('%s', img_object.cur_img);
	$(img_object.cur_img).show();
}

function slideshow(){
	img_object.next_img = img_object.rand_array.pop();
	//(new Image()).src = img_object.img_pattern.replace('%s', img_object.next_img);
	new Effect.Fade(img_object.cur_img, {duration: 3.0});
	new Effect.Appear(img_object.next_img, {duration: 3.0});
	img_object.cur_img = img_object.next_img;
	if (img_object.rand_array.length == 0)
	{
		img_object.rand_array = img_object.img_array.slice(0);
		img_object.rand_array.sort(rand_ord);
	}
}

var banner = {
	img_array: new Array('img1','img2','img3','img4','img5','img6'),
	rand_array: new Array(),
	cur_img: '',
	next_img: '',
	img_pattern: '/img/banner/%s.jpg'
};