delete all inbox

var messages = $('#chat-messages').children();
for (var i = 0; i < messages.length; i++) {
    for (var j = 0; j < messages[i].classList.length; j++) {
        if (messages[i].classList[j].indexOf('cid-') == 0) {
            API.moderateDeleteChat(messages[i].classList[j].substr(4));
            break;
        }
    }
}