var conf_reflection_p = 0.2;
var conf_focus = 3;
var conf_slider_width = 14;
var conf_images_cursor = 'pointer';
var conf_slider_cursor = 'default';
var xstep = 150;
var scale = 0.4;

var conf_imageflow = 'imageflow';
var conf_loading = 'loading';
var conf_images = 'images';
var conf_captions = 'captions';
var conf_scrollbar = 'scrollbar';
var conf_slider = 'slider';

var slidetime=3000;
var popup = 0;
var popup_name = '';
var popup_width = 0;
var popup_height = 0;

var startimage = 4;/**
 *	ImageFlow 0.9
 *
 *	This code is based on Michael L. Perrys Cover flow in Javascript.
 *	For he wrote that "You can take this code and use it as your own" [1]
 *	this is my attempt to improve some things. Feel free to use it! If
 *	you have any questions on it leave me a message in my shoutbox [2].
 *
 *	The reflection is generated server-sided by a slightly hacked  
 *	version of Richard Daveys easyreflections [3] written in PHP.
 *	
 *	The mouse wheel support is an implementation of Adomas Paltanavicius
 *	JavaScript mouse wheel code [4].
 *
 *	Thanks to Stephan Droste ImageFlow is now compatible with Safari 1.x.
 *
 *
 *	[1] http://www.adventuresinsoftware.com/blog/?p=104#comment-1981
 *	[2] http://shoutbox.finnrudolph.de/
 *	[3] http://reflection.corephp.co.uk/v2.php
 *	[4] http://adomas.org/javascript-mouse-wheel/
 */

var onloadEvent=window.onload;

function MM_openBrWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}

/* Define global variables */
var caption_id = 0;
var caption_id2 = 0;
var new_caption_id = 0;
var current = 0;
var target = 0;
var mem_target = 0;
var timer = 0;
var array_images = new Array();
var new_slider_pos = 0;
var dragging = false;
var dragobject = null;
var dragx = 0;
var posx = 0;
var new_posx = 0;
var slide;
var conf_titlediv = 'title_captions';
var maxImages = 0;
var debugOut=0;
var goTo=0;
var fixDimensions = 1;
var mAlert = 10;
/*
var popup=1
var popup_name = 'FlowGallery'
var popup_width = 1024;
var popup_height= 768;
*/
function step()
{
	switch (target < current-1 || target > current+1) 
	{
		case true:                
			moveTo(current + (target-current)/3);
			window.setTimeout(step, 50);
			timer = 1;
			break;

		default:
			timer = 0;
			break;
	}
}

function slideshow(i){
	var max = document.getElementById(conf_images).childNodes.length;
	max = max/2;
	max = Math.round(max)-1;
	if(i>max){
	   target=0;	 
	   glideTo(0,0);
	   slide=window.setTimeout("slideshow(1)", slidetime);
	   }
	else{
	   handle(-1);
	   i=i+1;
	   slide=window.setTimeout("slideshow("+i+")", slidetime);
	   }
	 }
function stopSlide(){
	window.clearTimeout(slide)
	}

function glideTo(x, new_caption_id)
{	
	if(isNaN(x)){
	  return false;
	  }
    goTo=x; 
	/* Animate gliding to new x position */
	target = x;
	mem_target = x;
	if (timer == 0)
	{
		window.setTimeout(step, 50);
		timer = 1;
	}

	
	/* Display new caption */
	caption_id = new_caption_id;
	caption = img_div.childNodes.item(array_images[caption_id]).getAttribute('alt');
	caption2 = img_div.childNodes.item(array_images[caption_id]).getAttribute('title');
	if (caption == '') caption = '&nbsp;';
	caption_div.innerHTML = caption;
      title_div.innerHTML = caption2;
    

	/* Set scrollbar slider to new position */
	if (dragging == false)
	{
            new_slider_pos = (scrollbar_width * (-(x*100/((max-1)*xstep))) / 100) - new_posx;
            slider_div.style.marginLeft = (new_slider_pos - conf_slider_width) + 'px';
	}
}

function moveTo(x){ 
 	current = x;
	
	
	var factor = (goTo/100)*5;
	var minimum = goTo-factor;
	var maximum = goTo+factor;
	
	
	var zIndex = max;
	var debug ='';
      var counter=1;
	/* Main loop */
	for (var index = 0; index < max; index++)
	{
		var image = img_div.childNodes.item(array_images[index]);
		var current_image = index * -xstep;

		/* Don't display images that are not conf_focussed */
		if ((current_image+max_conf_focus) < mem_target || (current_image-max_conf_focus) > mem_target)
		{
			image.style.visibility = 'hidden';
			image.style.display = 'none';
		}
		else 
		{
			var z = Math.sqrt(10000 + x * x) + 100;			
                  var tmp = 10 / (z * scale);
                  var scaler = 1-tmp;
                  if(counter == max_conf_focus){
                    scaler = 1
                    }
                  counter++;
                  

                  debug = debug + 'FILE: '+image.src+'\r\n';
                  debug = debug + 'Z: '+z+'\r\n';
                  debug = debug + 'scale: '+scale+'\r\n';
                  debug = debug + 'scaler: '+scaler+'\r\n';

                  var xs = x / z * size + size;

			/* Still hide images until they are processed, but set display style to block */
			image.style.display = 'block';
		
			/* Process new image height and image width */
            
			var new_img_w = image.width;
            
			var new_img_h = (image.h / image.w * image.pc) / z * size;
			
			switch ( new_img_h > max_height )
			{
				case false:
					var new_img_w = image.pc / z * size;
					break;

				default:
					new_img_h = max_height;
					var new_img_w = image.w * new_img_h / image.h;
					break;
			}
			
			
			
			
			var new_img_top = (images_width * 0.34 - new_img_h) + images_top + ((new_img_h / (conf_reflection_p + 1)) * conf_reflection_p);
			image.style.left = xs - (image.pc / 2) / z * size + images_left + 'px';
			
			if(new_img_w && new_img_h)
			{ 
				image.style.height = new_img_h + 'px'; 
				image.style.width = new_img_w + 'px'; 
				image.style.top = new_img_top + 'px';
			}
			image.style.visibility = 'visible';

			/* Set image layer through zIndex */
			switch ( x < 0 )
			{
				case true:
					zIndex++;
					break;

				default:
					zIndex = zIndex - 1;
					break;
			}
			
			/* Change zIndex and onclick function of the focussed image */
			switch ( image.i == caption_id )
			{
				case false:
					image.onclick = function() { stopSlide();glideTo(this.x_pos, this.i); }
					break;

				default:
				    zIndex = zIndex + 1;
					if (popup == 1){
					   image.onclick = function() {
						   MM_openBrWindow(this.url,popup_name,'width='+popup_width+',height='+popup_height);
						   }	
					   }
					 else{
  					    image.onclick = function() {stopSlide();document.location = this.url; }	 
					    }
					
					break;
			}
			image.style.zIndex = zIndex;
                  debug = debug + '--------------------\r\n';
		}
            
		x += xstep;
	}
if(debugOut==1){
  alert('debug: '+debug);
  }
}

/* Main function */
function refresh(onload)
{
	/* Cache document objects in global variables */
	imageflow_div = document.getElementById(conf_imageflow);
	img_div = document.getElementById(conf_images);
	scrollbar_div = document.getElementById(conf_scrollbar);
	slider_div = document.getElementById(conf_slider);
	caption_div = document.getElementById(conf_captions);
	title_div = document.getElementById(conf_titlediv);
	
	/* Cache global variables, that only change on refresh */
	images_width = img_div.offsetWidth;
	images_top = imageflow_div.offsetTop+20;
	images_left = imageflow_div.offsetLeft;
	max_conf_focus = conf_focus * xstep;
	size = images_width * 0.5;
	scrollbar_width = images_width * 0.6;
	conf_slider_width = conf_slider_width * 0.5;
	max_height = images_width * 0.51;

	/* Change imageflow div properties */
	//imageflow_div.style.height = max_height + 'px';
	imageflow_div.style.height = 350 + 'px';

	/* Change images div properties */
	img_div.style.height = images_width * 0.338 + 'px';

	/* Change captions div properties */
	caption_div.style.width = images_width + 'px';
	caption_div.style.marginTop = images_width * 0.03 + 'px';
   
    /* Change title div properties */
	title_div.style.width = images_width + 'px';

	/* Change scrollbar div properties */
	scrollbar_div.style.marginTop = images_width * 0.02 + 'px';
	scrollbar_div.style.marginLeft = images_width * 0.2 + 'px';
	scrollbar_div.style.width = scrollbar_width + 'px';
	
	/* Set slider attributes */
	slider_div.onmousedown = function () { dragstart(this); };
	slider_div.style.cursor = conf_slider_cursor;

	/* Cache EVERYTHING! */
	max = img_div.childNodes.length;
	var i = 0;
	for (var index = 0; index < max; index++)
	{ 
		var image = img_div.childNodes.item(index);
		if (image.nodeType == 1)
		{
			array_images[i] = index;
			
			/* Set image onclick by adding i and x_pos as attributes! */
			image.onclick = function() { glideTo(this.x_pos, this.i); }
			image.x_pos = (-i * xstep);
			image.i = i;
			
			/* Add width and height as attributes ONLY once onload */
			if(onload == true)
			{
				/*alert(image.width + ' - ' + image.height);*/
				image.w = image.width;
				image.h = image.height;
			}

			/* Check source image format. Get image height minus reflection height! */
			switch ((image.w + 1) > (image.h / (conf_reflection_p + 1))) 
			{
				/* Landscape format */
				case true:
					image.pc = 118;
					break;

				/* Portrait and square format */
				default:
					image.pc = 100;
					break;
			}

			/* Set ondblclick event */
			image.url = image.getAttribute('longdesc');
			if(popup==1){
			  image.ondblclick = function() {
				  MM_openBrWindow(image.url,popup_name,'width='+popup_width+',height='+popup_height);			  
			      }	
		      }
			else{
			  /* image.ondblclick = function() { document.location = this.url; } */
			  }
			
			

			/* Set image cursor type */
			image.style.cursor = conf_images_cursor;

			i++;
		}
	}
	max = array_images.length;

	/* Display images in current order */
	moveTo(current);
	glideTo(current, caption_id);
}

/* Show/hide element functions */
function show(id)
{
	var element = document.getElementById(id);
	element.style.visibility = 'visible';
}
function hide(id)
{
	var element = document.getElementById(id);
	element.style.visibility = 'hidden';
	element.style.display = 'none';
}

function init(){
  if(document.getElementById(conf_imageflow)){
     hide(conf_loading);
	 show('navigation');
	 refresh(true);
	 show(conf_images);
	 show(conf_scrollbar);
	 initMouseWheel();
	 initMouseDrag();
     if(startimage){
        glideTo((-(startimage-1)*xstep),startimage-1); 
        }
	  }
	}

/* Hide loading bar, show content and initialize mouse event listening after loading */
window.onload = init;

/* Refresh ImageFlow on window resize */
window.onresize = function()
{
	if(document.getElementById(conf_imageflow)) refresh();
}

/* Fixes the back button issue */
window.onunload = function()
{
  document = null;
}


/* Handle the wheel angle change (delta) of the mouse wheel */
function handle(delta)
{
	var change = false;
	switch (delta > 0)
	{
		case true:
			if(caption_id >= 1)
			{
				target = target + xstep;
				/*alert(target);*/
				new_caption_id = caption_id - 1;
				change = true;
			}
			else
			{
			target = ((max-1)*xstep)*-1;
			new_caption_id = max-1;
            change = true;
			}
			break;

		default:
			if(caption_id < (max-1))
			{
				target = target - xstep;
				new_caption_id = caption_id + 1;
				change = true;
			}
			else{
			target = 0;
			new_caption_id = 0;
			change = true;
			}
			break;
	}

	/* Glide to next (mouse wheel down) / previous (mouse wheel up) image */
	if (change == true)
	{
		glideTo(target, new_caption_id);
	}
}

/* Event handler for mouse wheel event */
function wheel(event)
{
	var delta = 0;
	if (!event) event = window.event;
	if (event.wheelDelta)
	{
		delta = event.wheelDelta / 120;
	}
	else if (event.detail)
	{
		delta = -event.detail / 3;
	}
	if (delta) handle(delta);
	if (event.preventDefault) event.preventDefault();
	event.returnValue = false;
}

/* Initialize mouse wheel event listener */
function initMouseWheel()
{
	if(window.addEventListener) imageflow_div.addEventListener('DOMMouseScroll', wheel, false);
	imageflow_div.onmousewheel = wheel;
}

/* This function is called to drag an object (= slider div) */
function dragstart(element)
{
	dragobject = element;
	dragx = posx - dragobject.offsetLeft + new_slider_pos;
}

/* This function is called to stop dragging an object */
function dragstop()
{
	dragobject = null;
	dragging = false;
}

/* This function is called on mouse movement and moves an object (= slider div) on user action */
function drag(e)
{
	posx = document.all ? window.event.clientX : e.pageX;
	if(dragobject != null)
	{
		dragging = true;
		new_posx = (posx - dragx) + conf_slider_width;

		/* Make sure, that the slider is moved in proper relation to previous movements by the glideTo function */
		if(new_posx < ( - new_slider_pos)) new_posx = - new_slider_pos;
		if(new_posx > (scrollbar_width - new_slider_pos)) new_posx = scrollbar_width - new_slider_pos;
		
		var slider_pos = (new_posx + new_slider_pos);
		var step_width = slider_pos / ((scrollbar_width) / (max-1));
		var image_number = Math.round(step_width);
		var new_target = (image_number) * -xstep;
		var new_caption_id = image_number;

		dragobject.style.left = new_posx + 'px';
		glideTo(new_target, new_caption_id);
	}
}

/* Initialize mouse event listener */
function initMouseDrag()
{
	document.onmousemove = drag;
	document.onmouseup = dragstop;

	/* Avoid text and image selection while dragging  */
	document.onselectstart = function () 
	{
		if (dragging == true)
		{
			return false;
		}
		else
		{
			return true;
		}
	}
}

function getKeyCode(event)
{
	event = event || window.event;
	return event.keyCode;
}

document.onkeydown = function(event)
{
	var charCode  = getKeyCode(event);
	switch (charCode)
	{
		/* Right arrow key */
		case 39:
			handle(-1);
			break;
		
		/* Left arrow key */
		case 37:
			handle(1);
			break;
	}
}

/*
window.onload=onLoadHandler;
function onLoadHandler(){
    if(onloadEvent){
	  var evalcode='window.onload = ' + onloadEvent;
  	  eval(evalcode);	
	  }
    
	}
*/
onLoadHandler = {
    // Initialisierungsfunktion, um Einstellungen für meinObjekt vorzunehmen
    init : function () {
    },
    // Flow starten
	startflow : function (){
		init();
		},
    // onload-Handler erweitern
    onloadEinbinden : function () {
        if (typeof(window.onload) == "function")
            // alten Handler speichern
            onLoadHandler.oldWinOnLoad = window.onload;
            // onload-Handler in eine Funktion einwickeln
            window.onload = function () {
              if (onLoadHandler.oldWinOnLoad)
                // existiert nur, wenn auch eine Funktion drinnesteckt
                onLoadHandler.oldWinOnLoad(); // alte onload-Funktion(en) ausführen
                onLoadHandler.init();
        };
    } // hier natürlich KEIN KOMMA (weil keine weitere Methode/Eigenschaft mehr folgt)
}; // meinObjekt zu Ende

// Jetzt in den onload-Event einbinden:
onLoadHandler.onloadEinbinden();