function showDiv(divToShow) {
	var text1 = document.getElementById('text1');
	var text2 = document.getElementById('text2');
	var text3 = document.getElementById('text3');
	var textToShow = document.getElementById(divToShow);
	
	if (textToShow == null)
		textToShow = text1;
	
	text1.style.display = 'none'; 
	if (text2 != null)
		text2.style.display = 'none'; 
	if (text3 != null)
		text3.style.display = 'none'; 
	
	textToShow.style.display = 'block'; 
}

function showImageDiv(divToShow) {
	var image1 = document.getElementById('image1');
	var image2 = document.getElementById('image2');
	var image3 = document.getElementById('image3');
	var imageToShow = document.getElementById(divToShow);
	
	if (imageToShow == null)
		imageToShow = image1;
	
	image1.style.display = 'none'; 
	if (image2 != null)
		image2.style.display = 'none'; 
	if (image3 != null)
		image3.style.display = 'none'; 
	
	imageToShow.style.display = 'block'; 
}