title: Adding "0" if clock have one digit
body: <p>i have some clock script. Everything is fine and it's work perfectly but... i have one problem. If at the clock is set one digit hour or minute like 1:5 clock not adding "0" digit before. This what i'v done but it does't work. Can u help me, much thx?</p>
  
  <pre><code>window.setInterval(function update_clock() {
      var currentTime = new Date();
      var currentHours = currentTime.getHours();
      var currentMinutes = currentTime.getMinutes();
      $.ajax({
          success: function (clock) {
              document.getElementById("hour").firstChild.nodeValue = currentHours;
              document.getElementById("minutes").firstChild.nodeValue = currentMinutes;
              if (currentMinutes.length == 1) {
                  currentMinutes = "0" + currentMinutes;
              }
          }
      });
  }, 999);
  </code></pre>