function getCookieVal(offset) {
    var endstr = document.cookie.indexOf(";", offset);
    if (endstr == -1) {
        endstr = document.cookie.length;
    }
    return unescape(document.cookie.substring(offset, endstr));
}

function GetCookie(name) {
    var arg = name + "=";
    var alen = arg.length;
    var clen = document.cookie.length;
    var i = 0;
    while (i < clen) {
        var j = i + alen;
        if (document.cookie.substring(i, j) == arg) {
            return getCookieVal(j);
        }
        i = document.cookie.indexOf(" ", i) + 1;
        if (i == 0) {
            break;
        }
    }
    return null;
}

function SetCookie(name, value) {
    var argv = SetCookie.arguments;
    var argc = SetCookie.arguments.length;
    var expires = argc > 2 ? argv[2] : null;
    var path = argc > 3 ? argv[3] : null;
    var domain = argc > 4 ? argv[4] : null;
    var secure = argc > 5 ? argv[5] : false;
    document.cookie = name + "=" + escape(value) + (expires == null ? "" : "; expires=" + expires.toGMTString()) + (path == null ? "" : "; path=" + path) + (domain == null ? "" : "; domain=" + domain) + (secure == true ? "; secure" : "");
}

function alterar(valor, cookie, id) {
    var expdate = new Date;
    expdate.setTime(expdate.getTime() + 2678400000);
    v = Number(GetCookie(cookie)) + Number(valor);
    if (v != Number) {
        SetCookie(cookie, 3, expdate);
    }
    if (v < 1) {
        v = 1;
    }
    if (v > 5) {
        v = 5;
    }
    document.getElementById(id).className = "ft" + v;
    SetCookie(cookie, v, expdate);
}