var ss;
var backToFirst = false;

$(document).ready(function() {		
	//Execute the slideShow
	slideShow();

});

function slideShow() {

	//Set the opacity of all images to 0
	$('#gallery span').css({opacity: 0.0});
	
	//Get the first image and display it (set it to full opacity)
	$('#gallery span:first').css({opacity: 1.0});
			
	ss = setInterval('gallery()',4000);
	
}

function gallery() {
	
	//if no IMGs have the show class, grab the first image
	var current = ($('#gallery span.show') ? $('#gallery span.show') : $('#gallery span:first'));
	var next;
	
	if (current.next().length) {
		//Get next image, if it reached the end of the slideshow, rotate it back to the first image
		next = current.next();	
	}
	else {
		next = $('#gallery span:first');	
		backToFirst = true;
	}
	//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}, 1000);

	//Hide the current image
	current.animate({opacity: 0.0}, 1000)
	.removeClass('show');
	
	if (backToFirst) {
		// don't rotate again
		clearInterval(ss);	
	}
	
}