function $(eid){return document.getElementById(eid) || null};
function fbSubmit()
{
    fbTitle = $('feedback-input-title').value;
    if(fbTitle == '')
    {
        alert('请输入标题');
        return false;
    }    

    fbCaptcha = $('authNum').value;
    inputMd5 = calcMD5(fbCaptcha);
    if(capMd5 != inputMd5)
    {
        alert('请输入正确的验证码');
        return false;
    }
    return true;
}

function authRefresh()
{
    $('authPic').src = 'auth.php?' + Math.random().toString();
}