// preload
var img_num = 0;
var image_path = "img/";
var pre_images = new Array;

function all_preload() {
	for (i = 0; i < all_preload.arguments.length; i++) {
		preload(all_preload.arguments[i]);
	}
}

function preload(name) {
	pre_images[img_num] = new Image;
	pre_images[img_num].src = img_name(name, "1");
	img_num++;
}

function img_name(name, num) {
	return image_path + name + num + ".gif";
}

// rollover
function chg_navi(name, num) {
	var e = "document." + name + ".src='" + img_name(name, num) + "'";
	eval(e);
}