window.addEvent('domready', function() {
   
	var mySlide = new Fx.Slide('mp3_2', {duration: '1000', transition: 'bounce:out'});
    var mySlide1 = new Fx.Slide('mp3_1');
	mySlide.hide();
	
	$('mp3_1').addEvent('click', function() {
	mySlide1.hide();
    mySlide.slideIn();
	});
});

window.addEvent('domready', function() {
   
	var mySlide = new Fx.Slide('mp4_2', {duration: '1000', transition: 'bounce:out'});
    var mySlide1 = new Fx.Slide('mp4_1');
	mySlide.hide();
	
	$('mp4_1').addEvent('click', function() {
	mySlide1.hide();
    mySlide.slideIn();
	});
});