addLoadListener(function() {
						 
	var n = 6; // number of photos to be used on page
	var photos = 29; // number of photos to choose from
	var rand = new Array(n)
	var topimage = new Array(n)
	
	for (var i = 0; i < n; i++) {
  		
		// check for duplicates
		do {
    		rand[i] = Math.floor(Math.random() * photos);
    		var ok = true;
    		for (var j = 0; j < i; j++) {
				if (rand[j] == rand[i]) {
					ok = false;
				}
			}
  		} while (!ok)
		
		topimage[i] = 'topimage' + (i + 1);		
		topimage[i] = document.getElementById(topimage[i]);
				
		if (topimage[i] != null) { 
			topimage[i].src = 'images/random-main/main-' + rand[i] + '.jpg';
		}
	}	
});

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();
      };
    }
  }
}