function preload() {
var img01 = new Image();
var img02 = new Image();
var img03 = new Image();
var img04 = new Image();
var img05 = new Image();
var img06 = new Image();
var img07 = new Image();
var img08 = new Image();
var img09 = new Image();
var img10 = new Image();
var img11 = new Image();
var img12 = new Image();
img01.src = "http://www.sinwanet.co.jp/image/btn_home_on.gif";
img02.src = "http://www.sinwanet.co.jp/image/btn_company_on.gif";
img03.src = "http://www.sinwanet.co.jp/image/btn_recruit_on.gif";
img04.src = "http://www.sinwanet.co.jp/image/header_contact_on.gif";
img05.src = "http://www.sinwanet.co.jp/image/global_menu_01_on.gif";
img06.src = "http://www.sinwanet.co.jp/image/global_menu_02_on.gif";
img07.src = "http://www.sinwanet.co.jp/image/global_menu_03_on.gif";
img08.src = "http://www.sinwanet.co.jp/image/global_menu_04_on.gif";
img09.src = "http://www.sinwanet.co.jp/image/global_menu_05_on.gif";
img10.src = "http://www.sinwanet.co.jp/image/global_menu_06_on.gif";
img11.src = "http://www.sinwanet.co.jp/image/global_menu_07_on.gif";
img12.src = "http://www.sinwanet.co.jp/image/global_menu_08_on.gif";
}