function getCookie(name) { 
    var re = new RegExp(name+'=[^;]+', 'i');
    if (document.cookie.match(re)) {
        return document.cookie.match(re)[0].split('=')[1];
    }
    return null;
}

function setCookie(name, value, days) {
    var expireDate = new Date();
    var expstring= (typeof days!='undefined') ? expireDate.setDate(expireDate.getDate()+parseInt(days)) : expireDate.setDate(expireDate.getDate() - 5);
    document.cookie = name + '=' + value + '; expires=' + expireDate.toGMTString() + '; path=/';
}

function setBackground(background, background2) {
    document.getElementsByTagName('body')[0].style.backgroundImage = 'url(' + escape(background) + ')';
    setCookie('background', background, 7);
    if (typeof(background2) != 'undefined') {
        document.getElementById('wrapper').style.backgroundImage = 'url(' + escape(background2) + ')';
        setCookie('background2', background2, 7);
    } else {
        document.getElementById('wrapper').style.backgroundImage = 'none';
        setCookie('background2', '', 7);
    }
}