[рони]

crystaltrumpet,

var mya = true, tm;
function startClock() {
    clearTimeout(tm);
    if (vtime == stattime) {
        document.getElementById('blockwait').style.display = 'none';
        document.getElementById('blocktimer').style.display = '';
    }

    if (vtime > 0 && mya ) {
        vtime--;
        document.forms['frm'].clock.value = vtime;
        tm = setTimeout(startClock, 1000);
    }
}

 window.onfocus = function(){ mya = true; startClock()}
 window.onblur = function(){ mya = false;}