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();
var img13 = new Image();
var img14 = new Image();
var img15 = new Image();
var img16 = new Image();
var img17 = new Image();
img01.src = "http://www.pecj.co.jp/image/global_menu01_on.gif";
img02.src = "http://www.pecj.co.jp/image/global_menu02_on.gif";
img03.src = "http://www.pecj.co.jp/image/global_menu03_on.gif";
img04.src = "http://www.pecj.co.jp/image/global_menu04_on.gif";
img05.src = "http://www.pecj.co.jp/image/lang_en_on.gif";
img06.src = "http://www.pecj.co.jp/image/lang_ch_on.gif";
img07.src = "http://www.pecj.co.jp/image/btn_contact_on.gif";
img08.src = "http://www.pecj.co.jp/image/leftmenu_home_on.gif";
img09.src = "http://www.pecj.co.jp/image/btn_pagetop_on.gif";
img10.src = "http://www.pecj.co.jp/recruit/image/leftmenu_recruit01_on.gif";
img11.src = "http://www.pecj.co.jp/recruit/image/leftmenu_recruit02_on.gif";
img12.src = "http://www.pecj.co.jp/recruit/image/leftmenu_recruit03_on.gif";
img13.src = "http://www.pecj.co.jp/recruit/image/leftmenu_recruit04_on.gif";
img14.src = "http://www.pecj.co.jp/recruit/image/leftmenu_recruit05_on.gif";
img15.src = "http://www.pecj.co.jp/recruit/image/leftmenu_recruit06_on.gif";
img16.src = "http://www.pecj.co.jp/recruit/image/leftmenu_recruit07_on.gif";
img17.src = "http://www.pecj.co.jp/recruit/image/btn_entry_on.gif";
}