function quackquackgmt() {

var today=new Date();
var h=today.getUTCHours();
var m=today.getUTCMinutes();
var s=today.getUTCSeconds();
// add a zero in front of numbers<10
m=checkTime(m);
s=checkTime(s);
document.getElementById('id_gmt').innerHTML=h+":"+m+":"+s+" GMT";

setTimeout("quackquackgmt()", SetTimeOutPeriod);
}

function putspan() {
 document.write("<span id='id_gmt'></span>");
}

function checkTime(i){
    if (i<10) i="0" + i;
    return i;
}

var SetTimeOutPeriod = 1000;
putspan();
quackquackgmt();