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<p id="countdown"><span></span></p>
<script>
var countdown = $('#countdown span'),
    timer;
function startCountdown(){
    var startFrom = 5;
    countdown.text(startFrom).parent('p').show();
    timer = setInterval(function(){
        countdown.text(--startFrom);
        if(startFrom <= 0) {
            clearInterval(timer);
            countdown.text('грузим!');
        }
    },1000);
}
</script>