gistfile1.js

var currHhmm;

function refreshClock() {
    var d = new Date;
    var hh = d.getHours();
    var mm = d.getMinutes();
    if (hh < 10) hh = "0" + hh;
    if (mm < 10) mm = "0" + mm;
    var hhmm = [hh, mm].join('');
    if ( currHhmm !== hhmm) {
        currHhmm = hhmm;
        var src = "http://bijint.com/m/img/photo/" + hhmm + ".jpg";
        document.getElementById('clock').innerHTML = '<img width="345" height="460" src="' + src + '"/>';
    }
    setTimeout(refreshClock, 1000 * 5);
}