window.addEvent('domready', function() {
	if (!hasMP4Player())
	{
		
		var mp4Links = $$('a[href$=mp4]');
		mp4Links.each(
			function(mp4Link, i)
			{
			    var alternateHref = mp4Link.get('href').replace('.mp4', '.avi');
			   
                            var alternateLink = new Element('a');
                            alternateLink.set('href', alternateHref);
                            alternateLink.set('text', mp4Link.get('text'));
                            alternateLink.set('class', mp4Link.get('class'));
                            alternateLink.set('target', mp4Link.get('target'));
                            alternateLink.inject(mp4Link, 'before');
                            mp4Link.destroy();
                        });
            }
});