// JavaScript Document


var pre_images = new Array();

function pre_load(key, src) {
	var img = new Image();
	img.src = src;
	
	pre_images[key] = img;
}

function swap_image(obj, key) {
	if(!pre_images[ key ]) return;
	obj.style.backgroundImage = 'url(\''+ pre_images[key].src +'\')';
}

pre_init = function do_pre_init() {
	pre_load('menu', '/public/site/images/menu_bg.jpg');
	pre_load('menu_active', '/public/site/images/menu_bg_active.jpg');
	
	pre_load('plus', '/public/site/images/plus.jpg');
	pre_load('min', '/public/site/images/min.jpg');
}

addLoadEvent(pre_init);