var images_count = 5;
var pic_url_prefix = "http://www.adrevolver.com/pic/m";
var pic_id_prefix = "pic";
var pic_extension = ".gif";

var images_array;
var page_loaded = false;

function preload_images()
{
	var i, image_index, elements_count = images_count * 2,
		pic_url_infix, pic_url_postfix;
	images_array = new Array(elements_count);

	for (i = 0; i < elements_count; i++)
	{
		images_array[i] = new Image();
		image_index = Math.floor(i / 2) + 1;

		pic_url_infix = image_index == page_for_section ? "h" : "";
		pic_url_postfix = i & 1 ? "_1" : "";

		images_array[i].src = pic_url_prefix + pic_url_infix 
			+ image_index + pic_url_postfix + pic_extension;
		
		if ((image_index == page_for_section) && !(i & 1))
			document.images[pic_id_prefix + image_index].src
				= images_array[i].src;
	}

	page_loaded = true;
}

function roll_image(image_index, rolled) 
{
	if ((image_index == page_for_section) && root_page_in_section)
		return;

	if (!page_loaded)
		return;

	document.images[pic_id_prefix + image_index].src
		= images_array[(image_index - 1) * 2 + rolled].src;
}