var caseStudyArray = new Array();
var currentCaseStudyNumber;
var currentCaseStudySlide;
var isInitialized = false;
function startSlideshow()
{
	
	if (!isInitialized)
	{
		initialize();
	}
	function initialize()
	{
		caseStudyArray = populateCaseStudyArray($(".caseStudy"));
		// Set Next Button
		$("#ss_nextButton").click(function()
			{
			advanceSlide();
			return false;
			}
		);
		$("#ss_prevButton").click(function()
			{
			reverseSlide();
			return false;
			}
		);
		$(window).resize(function() {
				// Get page sizes
				var arrPageSizes = ___getPageSize();
				// Style overlay and show it
				$('#jquery-overlay').css({
					width:		arrPageSizes[0],
					height:		arrPageSizes[1],
				});
				// Get page scroll
				var arrPageScroll = ___getPageScroll();
				// Calculate top and left offset for the jquery-lightbox div object and show it
				$('#jquery-lightbox').css({
					top:	arrPageScroll[1] + (arrPageSizes[3] / 10),
					left:	arrPageScroll[0]
				});
			});
		isInitialized = true;
	}
	currentCaseStudyNumber = 0;
	currentCaseStudySlide = $(caseStudyArray[currentCaseStudyNumber]);
	showSlide(currentCaseStudySlide);
	
	// Apply the HTML markup into body tag
	$('body').append('<div id="jquery-overlay"></div>');
	// Get page sizes
	var arrPageSizes = ___getPageSize();
	// Style overlay and show it
	$('#jquery-overlay').css({
		backgroundColor:	'#000',
		opacity:			'0.8',
		width:				arrPageSizes[0],
		height:				arrPageSizes[1]
	}).fadeIn();
	$('#caseStudies').fadeIn();
	$('#ss_controls').css({display:'block'});
	showButtons();
	// Assigning click events in elements to close overlay
	$('#jquery-overlay').click(function() {
		_finish();									
	});
	$('#ss_closeButton').click(function() {
		_finish();
		return false;								
	});
	
}
function showButtons()
{
	if(!isLastSlide())
	{
		$("#ss_nextButton").css({display:"block"});
	}
	else
	{
		
		$("#ss_nextButton").css({display:"none"});
	}
	if(!isFirstSlide())
	{
		$("#ss_prevButton").css({display:"block"});
	}
	else
	{
		$("#ss_prevButton").css({display:"none"});
	}
}
function advanceSlide()
{
	hideSlide(currentCaseStudySlide);
	++currentCaseStudyNumber;
	var nextSlide = $(caseStudyArray[currentCaseStudyNumber]);
	showSlide(nextSlide);
	currentCaseStudySlide = nextSlide;
	showButtons();
	
}
function reverseSlide()
{
	hideSlide(currentCaseStudySlide);
	--currentCaseStudyNumber;
	var nextSlide = $(caseStudyArray[currentCaseStudyNumber]);
	showSlide(nextSlide);
	currentCaseStudySlide = nextSlide;
	showButtons();
}
function showSlide(slide)
{
	slide.fadeIn();
	
}

function hideSlide(slide)
{
	slide.fadeOut();
}

function isLastSlide()
{
	var isLastSlide = false;
	if ((currentCaseStudyNumber + 1)>=caseStudyArray.length)
	{
		isLastSlide = true;
	}
	return isLastSlide;
}
function isFirstSlide()
{
	var isFirstSlide = false;
	if (currentCaseStudyNumber==0)
	{
		isFirstSlide = true;
	}
	return isFirstSlide;
}


/**
 * Remove jQuery lightBox plugin HTML markup
 *
 */
function _finish()
{
	//$('#jquery-lightbox').remove();
	hideSlide(currentCaseStudySlide);
	$('#jquery-overlay').fadeOut(function() { $('#jquery-overlay').remove(); });
	$('#ss_controls').fadeOut();
	$('#caseStudies').fadeOut();
	// Show some elements to avoid conflict with overlay in IE. These elements appear above the overlay.
	//$('embed, object, select').css({ 'visibility' : 'visible' });
}	
		
function populateCaseStudyArray(resultSet)
{
	var caseStudyArray = new Array();
	resultSet.each(function(){caseStudyArray.push(this);});
	return caseStudyArray;
}	

// * getPageSize() by quirksmode.com
// *
// * @return Array Return an array with page width, height and window width, height
// */
function ___getPageSize() {
	var xScroll, yScroll;
	if (window.innerHeight && window.scrollMaxY) {	
		xScroll = window.innerWidth + window.scrollMaxX;
		yScroll = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}
	var windowWidth, windowHeight;
	if (self.innerHeight) {	// all except Explorer
		if(document.documentElement.clientWidth){
			windowWidth = document.documentElement.clientWidth; 
		} else {
			windowWidth = self.innerWidth;
		}
		windowHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
	} else if (document.body) { // other Explorers
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
	}	
	// for small pages with total height less then height of the viewport
	if(yScroll < windowHeight){
		pageHeight = windowHeight;
	} else { 
		pageHeight = yScroll;
	}
	// for small pages with total width less then width of the viewport
	if(xScroll < windowWidth){	
		pageWidth = xScroll;		
	} else {
		pageWidth = windowWidth;
	}
	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight);
	return arrayPageSize;
};
// * getPageScroll() by quirksmode.com
//		 *
//		 * @return Array Return an array with x,y page scroll values.
//		 */
		function ___getPageScroll() {
			var xScroll, yScroll;
			if (self.pageYOffset) {
				yScroll = self.pageYOffset;
				xScroll = self.pageXOffset;
			} else if (document.documentElement && document.documentElement.scrollTop) {	 // Explorer 6 Strict
				yScroll = document.documentElement.scrollTop;
				xScroll = document.documentElement.scrollLeft;
			} else if (document.body) {// all other Explorers
				yScroll = document.body.scrollTop;
				xScroll = document.body.scrollLeft;	
			}
			arrayPageScroll = new Array(xScroll,yScroll);
			return arrayPageScroll;
		};