today = new Date();
day = today.getDay();
arday = new Array("img_index/0_topsplash/topsplash_01.jpg", "img_index/0_topsplash/topsplash_02.jpg", "img_index/0_topsplash/topsplash_03.jpg", 
"img_index/0_topsplash/topsplash_04.jpg", "img_index/0_topsplash/topsplash_05.jpg", "img_index/0_topsplash/topsplash_03.jpg", "img_index/0_topsplash/topsplash_02.jpg");

document.write("<img src='" + arday[day] + "'>");