/*************************************
*
*   Slideshow script for start page. Based on 
*   http://www.queness.com/post/1450/jquery-photo-slide-show-with-slick-caption-tutorial-revisited
*
*/
$(document).ready(function() {     
    //Execute the slideShow, setting how many ms each image should be shown
    slideShow(4000);
});

function slideShow(speed) {

	//append a LI item to the UL list for displaying caption
	$('ul.slideshow').append('<li id="slideshow-caption" class="caption"><div class="slideshow-caption-container"><h3></h3><p></p></div></li>');
 
	//Set the opacity of all images to 0
	$('ul.slideshow li').css({opacity: 0.0});
	
	//Get the first image and display it (set it to full opacity)
	var first = $('ul.slideshow li:first');
	first.css({opacity: 1.0});
	
	//Get the caption of the first image from alt attribute and display it
	var desc = first.find('img').attr('alt');	
	$('#slideshow-caption p').html(desc);
		
	//Display the caption
	if (typeof desc != 'undefined' && desc != '') $('#slideshow-caption').css({opacity: 0.7, bottom:0});
	
	//Call the gallery function to run the slideshow	
	var timer = setInterval('gallery()',speed);
	
	//pause the slideshow on mouse over
	$('ul.slideshow').hover(
		function () {
			clearInterval(timer);	
		}, 	
		function () {
			timer = setInterval('gallery()',speed);			
		}
	);
}
 
function gallery() {
	//if no IMGs have the show class, grab the first image
	var current = ($('ul.slideshow li.show')?  $('ul.slideshow li.show') : $('#ul.slideshow li:first'));
 
	//Get next image, if it reached the end of the slideshow, rotate it back to the first image
	var next = ((current.next().length) ? ((current.next().attr('id') == 'slideshow-caption')? $('ul.slideshow li:first') :current.next()) : $('ul.slideshow li:first'));
		
	//Get next image caption
	var desc = next.find('img').attr('alt');	
 
	//Set the fade in effect for the next image, show class has higher z-index
	next.css({opacity: 0.0}).addClass('show').animate({opacity: 1.0}, 200);
	
	//Hide the caption first, and then set and display the caption
	$('#slideshow-caption').animate({opacity: 0.0}, 100, null, function () { 
		$('#slideshow-caption p').html(desc); 
        if (typeof desc != 'undefined' && desc != '') {$('#slideshow-caption').animate({opacity: 0.7}, 100)}; 
	});		
    
	//Hide the current image
	current.animate({opacity: 0.0}, 200).removeClass('show');
}