function tick(div) {
    var container = document.getElementById(div);
    if(container){
        var hours, minutes, seconds, xfile;
        var intHours, intMinutes, intSeconds;
        var today, theday;
        today = new Date();
        function initArray(){
            this.length=initArray.arguments.length
            for(var i=0;i<this.length;i++)
            this[i+1]=initArray.arguments[i] 
        }
        var d=new initArray(
        "星期日",
        "星期一",
        "星期二",
        "星期三",
        "星期四",
        "星期五",
        "星期六");
        theday = today.getYear()+"-" + [today.getMonth()+1]+"-" +today.getDate() + ' ' + d[today.getDay()+1] + ' ';
        intHours = today.getHours();
        intMinutes = today.getMinutes();
        intSeconds = today.getSeconds();
        if (intHours == 0) {
            hours = "12:";
            xfile = "午夜";
        } else if (intHours < 12) {
            hours = intHours+":";
            xfile = "上午";
        } else if (intHours == 12) {
            hours = "12:";
            xfile = "正午";
        } else {
            intHours = intHours - 12
            hours = intHours + ":";
            xfile = "下午";
        }
        if (intMinutes < 10) {
            minutes = "0"+intMinutes+":";
        } else {
            minutes = intMinutes+":";
        }
        if (intSeconds < 10) {
            seconds = "0"+intSeconds+" ";
        } else {
            seconds = intSeconds+" ";
        }
        timeString = theday+xfile+hours+minutes+seconds;
        
        container.innerHTML = timeString;
        window.setTimeout("tick();", 100);
    }
}