addLoadListener(function()
{
  var picSelection = [
      ['images/our_commitment.jpg', 'Lily'],
      ['images/main_ruler.jpg', 'Ruler'],
	  ['images/main_rocks.jpg', 'Rocks'],
  	  ['images/main_anvil.jpg', 'Anvil'],
	  ['images/main_chemistry_beaker.jpg', 'Measuring Beaker']
  ];

  var n = Math.floor(Math.random() * picSelection.length);
  
  var img = document.getElementById('mainPic');

  img.src = picSelection[n][0];
  img.title = picSelection[n][1] + ' - Our commitment, our services. Patents, Trade Marks, Copyright, Designs';
  img.style.display = 'block';
});

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();
      };
    }
  }
}