calendar = new Date();
day = calendar.getDay();
month = calendar.getMonth();
date = calendar.getDate();
year = calendar.getYear();
if (year < 100) year = 1900 + year;
cent = parseInt(year / 100);
g = year % 19;
k = parseInt((cent - 17) / 25);
i = (cent - parseInt(cent / 4) - parseInt((cent - k) / 3) + 19 * g + 15) % 30;
i = i - parseInt(i / 28) * (1 - parseInt(i / 28) * parseInt(29 / (i + 1)) * parseInt((21 - g) / 11));
j = (year + parseInt(year / 4) + i + 2 - cent + parseInt(cent / 4)) % 7;
l = i - j;
emonth = 3 + parseInt((l + 40) / 44);
edate = l + 28 - 31 * parseInt((emonth / 4));
emonth--;
var dayname = new Array("星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六");
var monthname =
new Array("1月", "2月", "3月", "4月", "5月", "6月", "7月", "8月", "9月", "10月", "11月", "12月");
var now, hours, minutes, seconds, timeValue;
function showtime() {
    now = new Date();
    hours = now.getHours();
    minutes = now.getMinutes();
    seconds = now.getSeconds();
    timeValue = (hours >= 12) ? " 下午 " : " 上午 ";
    timeValue += ((hours > 12) ? hours - 12 : hours) + ":";
    timeValue += ((minutes < 10) ? "0" : "") + minutes + ":";
    timeValue += ((seconds < 10) ? "0" : "") + seconds + "";
    clock.innerHTML = timeValue;
    setTimeout("showtime()", 100);
}