title: Simultaneous code in javascript?
body: <p>How do I have two separate functions run simultaneously? If I wanted two clocks, one to count up and the other to count down, and I wanted them to run at the same time, how would I do it?</p>
  
  <p>If I just did:</p>
  
  <pre><code>var up = 1;
  while(true){
      document.write(up);
      up++;
      if(up==11)
          up=1;
  }
  var down = 10;
  while(true){
      document.write(down);
      down--;
      if(down==0)
          down=10;
  }
  </code></pre>
  
  <p>...it would just keep counting up...</p>