// Sterge mesajele vechi cand se trece de un total de:
var max_messages = 100;

setInterval(function() {
    var messages = document.querySelectorAll('#chatList > div');
    if (messages.length > max_messages) {
        for (var i = 0; i <= messages.length - max_messages; i++) {
            messages[i].remove();
        }
    }
}, 1E4);