var slideshowSpeed = 6000;
$(document).ready(function() {	
	var interval;
	var activeContainer = 1;	
	var currentImg = 0;
	var animating = false;
	var navigate = function(direction) {
		// Check if no animation is running. If it is, prevent the action
		if(animating) {return;}
		// Check which current image we need to show
		if(direction == "next") {
			currentImg++;
			if(currentImg == photos.length + 1) {currentImg = 1;}
		} else {
			currentImg--;
			if(currentImg == 0) {currentImg = photos.length;}
		}		
		// 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;
		currentZindex--;
		$("#headerimg" + activeContainer).css({
			"background-image" : "url(" + photoObject.image + ")",
			"display" : "block",
			"z-index" : currentZindex
		});
		// Fade out the current container
		// and display the header text when animation is complete
		$("#headerimg" + currentContainer).fadeOut(function() {
			setTimeout(function() {				
				animating = false;
			}, 500);
		});
	};
	// We should statically set the first image
	navigate("next");	
	// Start playing the animation
	interval = setInterval(function() {
		navigate("next");
	}, slideshowSpeed);	
});