function rand_time(form)
{
    var minute = '00' + Math.floor(Math.random() * 60);
    var hour = '00'+ (21 + Math.floor(Math.random() * 2));
    hour = hour.substr(hour.length-2, 2);
    minute = minute.substr(minute.length-2, 2);
    form.kl.value = hour+':'+minute;
}

function set_period(form, value) 
{
    form.pasa.value = value;
    for (i = 0; i < form.vil_pasu.length; i++)
    {
        if (form.vil_pasu[i].value == 'jamm')
        {
             form.vil_pasu[i].checked = true;
        }
    }
}

function p(n) { set_period(document.forms.pillan, n); }
function h(n) { set_period(document.forms.hringurinn, n); }
function m(n) { set_period(document.forms.misc, n); }

function main()
{
    if (document.forms.pillan) rand_time(document.forms.pillan);
    if (document.forms.hringurinn) rand_time(document.forms.hringurinn);
    if (document.forms.misc) rand_time(document.forms.misc);
}