Számláló blokkban

<script type="text/javascript">// <![CDATA[
        var interval;
        var minutes = 0;
        var seconds = 40;
 
        function countdown(element) {
                        interval = setInterval(function() {
                        var el = document.getElementById(element);
                        if(seconds == 0) {
                                    if(minutes == 0) {
                                             el.innerHTML = '0';
                                             clearInterval(interval);
                                             return;
                                     } else {
                                             minutes--;
                                             seconds = 60;
                                     }
                            }
                       if(minutes > 0) {
                                  var minute_text = minutes + (minutes > 1 ? ' perc' : ' perc');
                                      } else {
                                  var minute_text = '';
                              }
                      var second_text = seconds > 1 ? 'mp' : 'mp';
                      el.innerHTML = minute_text + ' ' + seconds + ' ' + second_text + ' van még.';
                      seconds--;
                     }, 1000);
                }
 
// ]]>
</script>
<p>
<input onclick="minutes=0;seconds=40;countdown('countdown');" value="Visszaszámlál" type="button">
</p>