function tokei(i) {
    GMT=i;
    gmt=new Date();
    now = new Date();
    jisa=now.getTimezoneOffset();

    gmt.setTime(now.getTime()+(jisa/60+parseFloat(GMT))*60*60*1000);
    year = gmt.getYear();
    month = gmt.getMonth()+1;
    day = gmt.getDate();
    wday=gmt.getDay();
    hour = gmt.getHours();
    minute = gmt.getMinutes();
    second = gmt.getSeconds();
if(document.getElementById("SelectForm").sTime[0].checked)
{
hour=hour+1
}

    if (hour < 10) { hour = '0' + hour }
    if (minute < 10) { minute = '0' + minute }
    if (second < 10) { second = '0' + second }
    if (wday==0)  {wday='日'}
    if (wday==1)  {wday='月'}
    if (wday==2)  {wday='火'}
    if (wday==3)  {wday='水'}
    if (wday==4)  {wday='木'}
    if (wday==5)  {wday='金'}
    if (wday==6)  {wday='土'}
    document.getElementById("SelectForm").clock.value = month + '月' + day + '日 '+ wday +'曜 ' + hour + ':' + minute;
    setTimeout("tokei(GMT)",1000);
}