window.onload = function () {

    var log = document.getElementById("log");

    var rows = log.getElementsByTagName("tr");

    var rownum = rows.length;

    for (var i = 0; i < rownum; i++) {

        var row = rows[i];

        if (row.getAttribute("class") == "message") {

            var nicktd = row.getElementsByClassName("nick")[0];

            if (nicktd) {

                var nick = nicktd.textContent;

                var sum = 0;

                for( var j = 0, iTop = nick.length; j < iTop; j++ ) {

                    sum += 0x56 ^ nick.charCodeAt(j);

                }

                nicktd.setAttribute("class","nick nick"+(sum % 10));

            }

        }

    }

};