function fadeIn(){
	
		opacityTween1 = new OpacityTween(document.getElementsByName('image1')[0],Tween.normalEaseOut, 100, 0, 1);
		opacityTween2 = new OpacityTween(document.getElementsByName('image2')[0],Tween.normalEaseOut, 0, 100, 1); 

		opacityTween1.start(); 
		opacityTween2.start();
	
	}
	
	function fadeOut(){
	
		opacityTween1 = new OpacityTween(document.getElementsByName('image2')[0],Tween.normalEaseOut, 100, 0, 1);
		opacityTween2 = new OpacityTween(document.getElementsByName('image1')[0],Tween.normalEaseOut, 0, 100, 1); 
		
		opacityTween1.start(); 
		opacityTween2.start();
	
	}