function scr_timedisp(arg0)
{
    var minutes = floor(arg0 / 1800);
    var seconds = round(((arg0 / 1800) - minutes) * 60);
    if (seconds == 60)
        seconds = 59;
    if (seconds < 10)
        seconds = "0" + string(seconds);
    var timedisp = string(minutes) + ":" + string(seconds);
    return timedisp;
}