var NumberofSlides;
var ThisSlide;
function NextSlide()
{
	var objectID = 'slide' + ThisSlide;
	var object = document.getElementById(objectID);
	object.style.display = 'none';
	if (ThisSlide == NumberofSlides) 
		{ThisSlide = 1}
	else 
		{ThisSlide = ThisSlide + 1};
	var objectID = 'slide' + ThisSlide;
	var object = document.getElementById(objectID);
	object.style.display = 'block';
}

function PreviousSlide()
{
	var objectID = 'slide' + ThisSlide;
	var object = document.getElementById(objectID);
	object.style.display = 'none';
	if (ThisSlide == 1) 
		{ThisSlide = NumberofSlides}
	else 
		{ThisSlide = ThisSlide - 1};
	var objectID = 'slide' + ThisSlide;
	var object = document.getElementById(objectID);
	object.style.display = 'block';
}

function Initialise(Num)
{
	var object = document.getElementById('waitMessage');
	object.style.display = 'none';
	object = document.getElementById('Controls');
	object.style.display = 'block';
	NumberofSlides = Num;
	ThisSlide = 1;
}