// JavaScript Document

id = Math.ceil(Math.random() * 21);

document.getElementById('top-body').style.background = 'url(/img/back_' + id + '.jpg) no-repeat #FFFFFF';
//document.getElementById('top-body').style.background-repeat:no-repeat;
document.getElementById('navigation').style.background = 'url(/img/menu_' + id + '.jpg)';