// Speed of the automatic slideshow
var slideshowSpeed = 3000;

// Variable to store the images we need to set as background
// which also includes some text and url's.
var photos = [ {
	"image" : "index1.jpg"
}, {
	"image" : "index2.jpg"
}, {
	"image" : "index3.jpg"
},{
	"image" : "index4.jpg"
},{
	"image" : "index5.jpg"
}

];


$(document).ready(function() {
		
	var interval;
	var activeContainer = 1;
	var currentImg=Math.floor(Math.random()*5);
	var animating = false;
	var navigate = function() {
		// Check if no animation is running. If it is, prevent the action
		if(animating) {
			return;
		}
		
		// Check which current image we need to show
		currentImg++;
		if(currentImg == photos.length + 1) {
			currentImg = 1;
		}
		
		// Check which container we need to use
		var currentContainer = activeContainer;
		if(activeContainer == 1) {
			activeContainer = 2;
		} else {
			activeContainer = 1;
		}
		
		showImage(photos[currentImg - 1], currentContainer, activeContainer);
		
	};
	
	var currentZindex = -1;
	var showImage = function(photoObject, currentContainer, activeContainer) {
		animating = true;
		
		// Make sure the new container is always on the background
		currentZindex--;
		
		// Set the background image of the new active container
		$("#bodyimg" + activeContainer).css({
			"background-image" : "url(images/background/" + photoObject.image + ")",
			"display" : "block",
			"z-index" : currentZindex
		});
				
		// Fade out the current container
		// and display the header text when animation is complete
		$("#bodyimg" + currentContainer).fadeOut(function() {
			setTimeout(function() {
				animating = false;
			}, 500);
		});
	};
	
	var stopAnimation = function() {
		
		// Clear the interval
		clearInterval(interval);
	};
	
	// We should statically set the first image
	navigate();
	
	// Start playing the animation
	interval = setInterval(function() {
		navigate();
	}, slideshowSpeed);
	
});