all_bg = new Image();
all_bg.src = "_images/all_bg.jpg";

nav_1 = new Image();
nav_1.src = "_images/nav_1_ro.jpg";

nav_2 = new Image();
nav_2.src = "_images/nav_2_ro.jpg";

nav_3 = new Image();
nav_3.src = "_images/nav_3_ro.jpg";

nav_4 = new Image();
nav_4.src = "_images/nav_4_ro.jpg";

nav_5 = new Image();
nav_5.src = "_images/nav_5_ro.jpg";

nav_6 = new Image();
nav_6.src = "_images/nav_6_ro.jpg";

nav_7 = new Image();
nav_7.src = "_images/nav_7_ro.jpg";

nav_8 = new Image();
nav_8.src = "_images/nav_8_ro.jpg";

nav_9 = new Image();
nav_9.src = "_images/nav_9_ro.jpg";