i1 = new Image;
i1.src = "img/menubook_on.gif";
i2 = new Image;
i2.src = "img/menusite.gif";
i3 = new Image;
i3.src = "img/menubook_off.gif";
i4 = new Image;
i4.src = "img/menu.gif";
i5 = new Image;
i5.src = "img/menu-book.gif";
i6 = new Image;
i6.src = "img/menu-site.gif";