var loggingEnabled = false;

function logIt(msg)
{
  if (loggingEnabled)
  {
    var theLogViewer = document.getElementById("logContainer");
    var theLog       = document.getElementById("log");
    theLog.innerHTML = theLog.innerHTML + msg + "\n";
    theLogViewer.scrollTop = theLogViewer.scrollHeight;  
  }
}

if (loggingEnabled)
{
  document.write("<div id='logContainer' style='height: 200px; width: 800px; overflow: auto;'><pre><span id='log'></span></pre></div>");
}