function trace(msg)
{
    var log = $('div#debug_trace');

    if (log.length == 0)
    {
        $(document.body).append("<div id='debug_trace' style='display:none'></div>");
        log = $('div#debug_trace');
    }

    log.append("<pre>" + msg + "</pre>");
}

function assert(test, message)
{
    if (!test)
    {
        message = "ASSERT: " + message;
        trace(message);
        window.alert(message);
    }
}