[tsigel]

var date1 = new Date('10.05.12 14:30');
    var date2 = new Date('10.05.12 15:20');
    var delta = date2-date1;
    var minutes = Math.round(delta / (60*1000));
    var hours = Math.floor(minutes / 60);
    minutes -= (hours * 60);
    alert(hours + ' ' + minutes);