function setTimeEl(id, timeDiff) {
    var dateObj = new Date();
    dateObj.setTime(dateObj.getTime() + dateOffset + timeDiff);
    var min = (dateObj.getMinutes() > 9) ? dateObj.getMinutes() : '0' + dateObj.getMinutes();
    var sec = (dateObj.getSeconds() > 9) ? dateObj.getSeconds() : '0' + dateObj.getSeconds();
    var timeStr = dateObj.getHours() + ':' + min + ':' + sec;
    document.getElementById(id).innerHTML = timeStr;
}

function updateTime() {
    // setup Hawaii DateTime
    setTimeEl('hawaiiTime', -(19*60*60*1000));

    // setup Japan DateTime
    setTimeEl('japanTime', 0);

    setTimeout("updateTime()", 1000);
}

var dateLocal  = new Date();
var dateServer = new Date('May 17, 2008 14:39:15');
var dateOffset = dateServer - dateLocal;
YAHOO.util.Event.onAvailable('japanTime', updateTime);