$(document).ready(function() {
	$.imgpreload(['../images/main_img_01.jpg','../images/main_img_02.jpg','../images/main_img_03.jpg','../images/main_img_04.jpg'],function()
		{
			var p = document.getElementById("headertxt");
			var fl = document.createElement("span");
				fl.setAttribute("id","firstline");
				p.appendChild(fl);
			var sl = document.createElement("span");
				sl.setAttribute("id","secondline");
				p.appendChild(sl);
			startSlideShow();
		}
	);
});
// Speed of the automatic slideshow
var slideshowSpeed = 10000;

// Variable to store the images we need to set as background
// which also includes some text and url's.
var photos = [ {
		"image" : "main_img_01.jpg",
		"url" : "http://www.didschroun.com/",
		"firstline" : "Didschroun.com - The Art of Music",
	}, {
		"image" : "main_img_02.jpg",
		"url" : "http://www.didschroun.com/",
		"firstline" : "Lernen Sie Didgeridoo spielen!",
	}, {
		"image" : "main_img_03.jpg",
		"url" : "http://www.didschroun.com/",
		"firstline" : "Eigenes Tonstudio",
	}, {
		"image" : "main_img_04.jpg",
		"url" : "http://www.didschroun.com/",
		"firstline" : "Unterrichtsort in Baar",
	}
];



function startSlideShow(){
	
	// Backwards navigation
	$("#back").click(function() {
		stopAnimation();
		navigate("back");
	});
	
	// Forward navigation
	$("#next").click(function() {
		stopAnimation();
		navigate("next");
	});
	
	var interval;
	$("#control").toggle(function(){
		stopAnimation();
	}, function() {
		// Change the background image to "pause"
		$(this).css({ "background-image" : "url(images/btn_pause.png)" });
		
		// Show the next image
		navigate("next");
		
		// Start playing the animation
		interval = setInterval(function() {
			navigate("next");
		}, slideshowSpeed);
	});
	
	
	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;
		
		// Make sure the new container is always on the background
		currentZindex--;
		
		// Set the background image of the new active container
		$("#headerimg" + activeContainer).css({
			"background-image" : "url(../images/" + photoObject.image + ")",
			"height" : "200px",
			"background-repeat" : "no-repeat",
			"display" : "block",
			"z-index" : currentZindex
		});
		
		// Hide the header text
		$("#headertxt").css({"display" : "none"});
		
		// Set the new header text
		$("#firstline").html(photoObject.firstline);
		$("#secondline").html(photoObject.secondline);
		$("#pictureduri")
			.attr("href", photoObject.url)
			.html(photoObject.title);
		
		
		// Fade out the current container
		// and display the header text when animation is complete
		$("#headerimg" + currentContainer).fadeOut(function() {
			setTimeout(function() {
				$("#headertxt").fadeIn(500, function () {
					animating = false;
				});
			}, 500);
		});
	};
	
	var stopAnimation = function() {
		// Change the background image to "play"
		$("#control").css({ "background-image" : "url(images/btn_play.png)" });
		
		// Clear the interval
		clearInterval(interval);
	};
	
	// We should statically set the first image
	navigate("next");
	
	// Start playing the animation
	interval = setInterval(function() {
		navigate("next");
	}, slideshowSpeed);	
}