function preLoad() {

	about_on = new Image();
	about_on.src = "images/about_on.gif";
	about_off = new Image();
	about_off.src = "images/about_off.gif";
	zone_on = new Image();
	zone_on.src = "images/zone_on.gif";
	zone_off = new Image();
	zone_off.src = "images/zone_off.gif";
	contact_on = new Image();
	contact_on.src = "images/contact_on.gif";
	contact_off = new Image();
	contact_off.src = "images/contact_off.gif";
	shop_on = new Image();
	shop_on.src = "images/shop_on.gif";
	shop_off = new Image();
	shop_off.src = "images/shop_off.gif";
	policy_on = new Image();
	policy_on.src = "images/policy_on.gif";
	policy_off = new Image();
	policy_off.src = "images/policy_off.gif";

	menu_about_on = new Image();
	menu_about_on.src = "images/menu_about_on.gif";
	menu_about_off = new Image();
	menu_about_off.src = "images/menu_about_off.gif";
	menu_zone_on = new Image();
	menu_zone_on.src = "images/menu_zone_on.gif";
	menu_zone_off = new Image();
	menu_zone_off.src = "images/menu_zone_off.gif";
	menu_contact_on = new Image();
	menu_contact_on.src = "images/menu_contact_on.gif";
	menu_contact_off = new Image();
	menu_contact_off.src = "images/menu_contact_off.gif";
	menu_shop_on = new Image();
	menu_shop_on.src = "images/menu_shop_on.gif";
	menu_shop_off = new Image();
	menu_shop_off.src = "images/menu_shop_off.gif";
	menu_policy_on = new Image();
	menu_policy_on.src = "images/menu_policy_on.gif";
	menu_policy_off = new Image();
	menu_policy_off.src = "images/menu_policy_off.gif";

}

function move_in(img_name,img_src) {
document[img_name].src=img_src;
}

function move_out(img_name,img_src) {
document[img_name].src=img_src;
}