preload("menu1","img/header1b.jpg" , "img/header1a.jpg");
preload("menu2","img/header2c.jpg" , "img/header2a.jpg");
preload("menu3","img/header3b.jpg" , "img/header3a.jpg");
preload("menu4","img/header4b.jpg" , "img/header4a.jpg");