addLoadListener(rotateRibbon);
function rotateRibbon()
{
  var ribbonImageName = 'ribbon';
  var imageNum = Math.floor(Math.random()*7) + 1;
  var imagePath= 'url(images/' + ribbonImageName + imageNum + '.jpg)';
  var ribbonDiv = document.getElementById('ribbon');
  ribbonDiv.style.backgroundImage = imagePath;
  ribbonDiv.style.visibility = 'visible';
  /* alert('ribbon image = ' + imagePath); */
};

function addLoadListener(fn)
{
  if (typeof window.addEventListener != 'undefined')
  {
    window.addEventListener('load', fn, false);
  }
  else if (typeof document.addEventListener != 'undefined')
  {
    document.addEventListener('load', fn, false);
  }
  else if (typeof window.attachEvent != 'undefined')
  {
    window.attachEvent('onload', fn);
  }
  else
  {
    var oldfn = window.onload;
    if (typeof window.onload != 'function')
    {
      window.onload = fn;
    }
    else
    {
      window.onload = function()
      {
        oldfn();
        fn();
      };
    }
  }
}