/*
	Lightbox JS: Fullsize Image Overlays 
	by Lokesh Dhakar - http://www.huddletogether.com

	For more information on this script, visit:
	http://huddletogether.com/projects/lightbox/

	Script featured on Dynamic Drive code library Jan 24th, 06':
	http://www.dynamicdrive.com

	Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
	(basically, do anything you want, just leave my name and link)
	
	Table of Contents
	-----------------
	Configuration
	
	Functions
	- getPageScroll()
	- getPageSize()
	- pause()
	- getKey()
	- listenKey()
	- showLightbox()
	- hideLightbox()
	- initLightbox()
	- addLoadEvent()
	
	Function Calls
	- addLoadEvent(initLightbox)

*/



//
// Configuration
//

// If you would like to use a custom loading image or close button reference them in the next two lines.
var loadingImage = '/media/images/loading.gif';
var closeButton = '/media/images/close.gif';		


var mediumImageId = 'mediumImage'

var containerSmallImagesId = 'smallImagesContainer';

var showZoom = true

var maxMediumHeight = -1;//426

var maxMediumWidth = -1;//300

var smallPrefix = "_size3"
var mediumPrefix = "_size2"
var largePrefix = "_size1"
var hugePrefix = "_size0"



//
// getPageScroll()
// Returns array with x,y page scroll values.
// Core code from - quirksmode.org
//
function getPageScroll(){

	var yScroll;

	if (self.pageYOffset) {
		yScroll = self.pageYOffset;
	} else if (document.documentElement && document.documentElement.scrollTop){	 // Explorer 6 Strict
		yScroll = document.documentElement.scrollTop;
	} else if (document.body) {// all other Explorers
		yScroll = document.body.scrollTop;
	}

	arrayPageScroll = new Array('',yScroll) 
	return arrayPageScroll;
}



//
// getPageSize()
// Returns array with page width, height and window width, height
// Core code from - quirksmode.org
// Edit for Firefox by pHaez
//
function getPageSize(){
	
	var xScroll, yScroll;
	
	if (window.innerHeight && window.scrollMaxY) {	
		xScroll = document.body.scrollWidth;
		yScroll = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}
	
	var windowWidth, windowHeight;
	if (self.innerHeight) {	// all except Explorer
		windowWidth = self.innerWidth;
		windowHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
	} else if (document.body) { // other Explorers
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
	}	
	
	// for small pages with total height less then height of the viewport
	if(yScroll < windowHeight){
		pageHeight = windowHeight;
	} else { 
		pageHeight = yScroll;
	}

	// for small pages with total width less then width of the viewport
	if(xScroll < windowWidth){	
		pageWidth = windowWidth;
	} else {
		pageWidth = xScroll;
	}


	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
	return arrayPageSize;
}


//
// pause(numberMillis)
// Pauses code execution for specified time. Uses busy code, not good.
// Code from http://www.faqts.com/knowledge_base/view.phtml/aid/1602
//
function pause(numberMillis) {
	var now = new Date();
	var exitTime = now.getTime() + numberMillis;
	while (true) {
		now = new Date();
		if (now.getTime() > exitTime)
			return;
	}
}

//
// getKey(key)
// Gets keycode. If 'x' is pressed then it hides the lightbox.
//

function getKey(e){
	if (e == null) { // ie
		keycode = event.keyCode;
	} else { // mozilla
		keycode = e.which;
	}
	key = String.fromCharCode(keycode).toLowerCase();
	
	if(key == 'x'){ hideLightbox(); }
}


//
// listenKey()
//
function listenKey () {	
	oldOnKeyPressHandler = document.onkeypress
	document.onkeypress = getKey; 
}
	

//
// showLightbox()
// Preloads images. Pleaces new image in lightbox then centers and displays.
//
function showLightbox(obj)
{
	var objLink = null
	var objImg = null
	
	if(obj.nodeName == "A"){
		objLink = obj
	}else{
		objImg = obj
	}
	
	if(document.all){
    	var selects = document.getElementsByTagName("select")
    	for(var i = 0; i< selects.length; i++){
       	selects[i].setAttribute("savedVisibilityStyle", selects[i].style.display); 
       	selects[i].style.visibility = "hidden";
    	}
    }
	// prep objects
	var objOverlay = document.getElementById('overlay');
	var objLightbox = document.getElementById('lightbox');
	var objCaption = document.getElementById('lightboxCaption');
	var objImage = document.getElementById('lightboxImage');
	var objLoadingImage = document.getElementById('loadingImage');
	var objLightboxDetails = document.getElementById('lightboxDetails');

	
	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();

	// center loadingImage if it exists
	if (objLoadingImage) {
		objLoadingImage.style.top = (arrayPageScroll[1] + ((arrayPageSize[3] - 35 - objLoadingImage.height) / 2) + 'px');
		objLoadingImage.style.left = (((arrayPageSize[0] - 20 - objLoadingImage.width) / 2) + 'px');
		objLoadingImage.style.display = 'block';
	}

	// set height of Overlay to take up whole page and show
	objOverlay.style.height = (arrayPageSize[1] + 'px');
	objOverlay.style.display = 'block';

	// preload image
	imgPreload = new Image();
	imgPreload.onload=function(){
		if(objLink){
			objImage.src = objLink.href;
		}else{			
			var index = objImg.getAttribute("index")			
			objImage.src = bigImagesNames[index];
			
			if(showZoom){
				
				objImage.setAttribute("index", index)	
				objImage.onmouseover = function showTransparentBox(e){
					//initialize traqnsparent
					var e = e ? e : window.event
					adjustPosition(e)
					document.getElementById("zoomframe").style.display = "block"
					document.getElementById("xlpreview").style.display = "block"
					
				}
				objImage.onmouseout = function hideTransparentBox(e){
					var zoomframe = document.getElementById("zoomframe")
					if(!inElement(zoomframe, e)){
						document.getElementById("zoomframe").style.display = "none"
						document.getElementById("xlpreview").style.display = "none"
					}
				}
				objImage.onmousemove = function moveTransparentBox(e){
					var e = e ? e : window.event
					adjustPosition(e)
				}
				//var document.getElementById()
				//alert(imgPreload.height)
				//document.getElementById("xlpreview").style.height = imgPreload.height + 20 + "px"
			}
		}

		// center lightbox and make sure that the top and left values are not negative
		// and the image placed outside the viewport
		var lightboxTop = arrayPageScroll[1] + ((arrayPageSize[3] - 35 - imgPreload.height) / 2);
		var lightboxLeft = ((arrayPageSize[0] - 20 - imgPreload.width) / 2);
		if(showZoom){
			lightboxLeft -= 125;
		}
		
		objLightbox.style.top = (lightboxTop < 0) ? "0px" : lightboxTop + "px";
		objLightbox.style.left = (lightboxLeft < 0) ? "0px" : lightboxLeft + "px";


		objLightboxDetails.style.width = imgPreload.width + 'px';
		var obj = objLink?objLink:objImg
		if(obj.getAttribute('title')){
			objCaption.style.display = 'block';
			//objCaption.style.width = imgPreload.width + 'px';
			objCaption.innerHTML = obj.getAttribute('title');
		} else {
			objCaption.style.display = 'none';
		}
		
		// A small pause between the image loading and displaying is required with IE,
		// this prevents the previous image displaying for a short burst causing flicker.
		if (navigator.appVersion.indexOf("MSIE")!=-1){
			pause(250);
		} 

		if (objLoadingImage) {	objLoadingImage.style.display = 'none'; }
		objLightbox.style.display = 'block';

		// After image is loaded, update the overlay height as the new image might have
		// increased the overall page height.
		arrayPageSize = getPageSize();
		objOverlay.style.height = (arrayPageSize[1] + 'px');
		
		// Check for 'x' keypress
		listenKey();

		return false;
	}
	if(objLink){
		imgPreload.src = objLink.href;
	}else{
		var index = objImg.getAttribute("index")
		//imgPreload.setAttribute("index", index)
		imgPreload.src = bigImagesNames[index];
	}
}


function adjustPosition(event){
	var zoomframe = document.getElementById("zoomframe")
	var lightboxImage = document.getElementById("lightboxImage")
					
	var lightbox = document.getElementById("lightbox");
	var pos = getCursorPosition(event)
	var posObj = getObjPosition(lightbox)
	
	
//	var zoomframeWidth = 125;
	if(zoomframeLoadedSizes == false){
		
		var xlimage = document.getElementById("xlimage")
		var width = xlimage.clientWidth
		if(width == 0){
			width = xlimage.width
		}
		var zoom = 250*document.getElementById("lightboxImage").clientWidth/width
		if(!zoom){
			zoomframeLoadedSizes = false
		}else{
			zoomframeLoadedSizes = true
		}
		zoomframeWidth = zoom
		zoomframeHeight = zoom		
	}

	var newPosX = (pos.x - posObj.x) - zoomframeWidth/2
	if(newPosX <= 9){
		newPosX = 9
	}
	
	if(newPosX + zoomframeWidth > lightboxImage.clientWidth + 9){
		newPosX = lightboxImage.clientWidth - zoomframeWidth + 9
	}
	
//	var zoomframeHeight = 125;
	var newPosY = (pos.y - posObj.y) - zoomframeHeight/2	
	if(newPosY <= 9){
		newPosY = 9
	}
	
	if(newPosY + zoomframeHeight > lightboxImage.clientHeight + 9){
		newPosY = lightboxImage.clientHeight - zoomframeHeight + 9
	}
	
	zoomframe.style.left = newPosX + "px"
	zoomframe.style.top = newPosY + "px"
	var xlimage = document.getElementById("xlimage")
	if(loadedXLIMage == false){
		xlimage.style.top = "120px"
		xlimage.style.left = "50px"		
	}else{
		
		kx = (xlimage.width - 250)/(lightboxImage.width-125)
	
		newPosX -= 9;
		newPosX *= kx
	
		xlimage.style.left = "-" + newPosX + "px"
	
		newPosY -= 9;
	
		ky = (xlimage.height - document.getElementById("xlpreview").clientHeight)/(lightboxImage.height-125)
		newPosY *= ky

		xlimage.style.top = "-" + newPosY + "px"
	}
	
	
}


//
// hideLightbox()
//
function hideLightbox()
{
	if(document.all){
    var selects = document.getElementsByTagName("select")
    for(var i = 0; i< selects.length; i++){            
    selects[i].style.visibility = selects[i].getAttribute("savedVisibilityStyle");
        } 
    }
	// get objects
	objOverlay = document.getElementById('overlay');
	objLightbox = document.getElementById('lightbox');

	// hide lightbox and overlay
	objOverlay.style.display = 'none';
	objLightbox.style.display = 'none';
	
	// disable keypress listener
	document.onkeypress = '';
}




//
// initLightbox()
// Function runs on window load, going through link tags looking for rel="lightbox".
// These links receive onclick events that enable the lightbox display for their targets.
// The function also inserts html markup at the top of the page which will be used as a
// container for the overlay pattern and the inline image.
//
function initLightbox()
{
	
	if (!document.getElementsByTagName){ return; }
	var anchors = document.getElementsByTagName("a");

	// loop through all anchor tags
	for (var i=0; i<anchors.length; i++){
		var anchor = anchors[i];

		if (anchor.getAttribute("href") && (anchor.getAttribute("rel") == "lightbox")){
			anchor.onclick = function () {showLightbox(this); return false;}
		}
	}

	// the rest of this code inserts html at the top of the page that looks like this:
	//
	// <div id="overlay">
	//		<a href="#" onclick="hideLightbox(); return false;"><img id="loadingImage" /></a>
	//	</div>
	// <div id="lightbox">
	//		<a href="#" onclick="hideLightbox(); return false;" title="Click anywhere to close image">
	//			<img id="closeButton" />		
	//			<img id="lightboxImage" />
	//		</a>
	//		<div id="lightboxDetails">
	//			<div id="lightboxCaption"></div>
	//			<div id="keyboardMsg"></div>
	//		</div>
	/*
			<div id="zoomframe" class="zoomframe"></div>
			<div id="xlpreview" class="xlpreview"><img id="xlimage" /></div>
	
	*/
	// </div>
	
	var objBody = document.getElementsByTagName("body").item(0);
	
	// create overlay div and hardcode some functional styles (aesthetic styles are in CSS file)
	var objOverlay = document.createElement("div");
	objOverlay.setAttribute('id','overlay');
	objOverlay.onclick = function () {hideLightbox(); return false;}
	objOverlay.style.display = 'none';
	objOverlay.style.position = 'absolute';
	objOverlay.style.top = '0';
	objOverlay.style.left = '0';
	objOverlay.style.zIndex = '90';
 	objOverlay.style.width = '100%';
	objBody.insertBefore(objOverlay, objBody.firstChild);
	
	
	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();

	// preload and create loader image
	var imgPreloader = new Image();
	
	// if loader image found, create link to hide lightbox and create loadingimage
	imgPreloader.onload=function(){

		var objLoadingImageLink = document.createElement("a");
		objLoadingImageLink.setAttribute('href','#');
		objLoadingImageLink.onclick = function () {hideLightbox(); return false;}
		objOverlay.appendChild(objLoadingImageLink);
		
		var objLoadingImage = document.createElement("img");
		objLoadingImage.src = loadingImage;
		objLoadingImage.setAttribute('id','loadingImage');
		objLoadingImage.style.position = 'absolute';
		objLoadingImage.style.zIndex = '150';
		objLoadingImageLink.appendChild(objLoadingImage);
		imgPreloader.onload=function(){};	//	clear onLoad, as IE will flip out w/animated gifs
		return false;
	}

	imgPreloader.src = loadingImage;

	// create lightbox div, same note about styles as above
	var objLightbox = document.createElement("div");
	objLightbox.setAttribute('id','lightbox');
	objLightbox.style.display = 'none';
	objLightbox.style.position = 'absolute';
	objLightbox.style.zIndex = '100';	
	if(showZoom){
		var zoomframe = document.createElement("div")
		zoomframe.onclick = function(){
			hideLightbox();
		}
		zoomframe.onmouseout = function onmouseooutFunc(e){			
			var e = e ? e : window.event
			var zoomframe = document.getElementById("zoomframe")
			if(!inElement(zoomframe, e)){
				document.getElementById("zoomframe").style.display = "none"
				document.getElementById("xlpreview").style.display = "none"
			}
		}

		zoomframe.setAttribute("id", "zoomframe")
		zoomframe.className = "zoomframe"
		zoomframe.onmousemove = function moveTransparentBox(e){
			var e = e ? e : window.event
			adjustPosition(e)
		}
		objLightbox.appendChild(zoomframe)
		
		var xlpreview = document.createElement("div")
		xlpreview.className = "xlpreview"
		xlpreview.setAttribute("id", "xlpreview")
		
		var xlimage = document.createElement("img")
		xlimage.setAttribute("id", "xlimage")
		xlpreview.appendChild(xlimage)
		objLightbox.appendChild(xlpreview)
	}
	objBody.insertBefore(objLightbox, objOverlay.nextSibling);
	
	// create link
	var objLink = document.createElement("a");
	objLink.setAttribute('href','#');
	objLink.setAttribute('title','Click to close');
	objLink.onclick = function () {hideLightbox(); return false;}
	objLightbox.appendChild(objLink);

	// preload and create close button image
	var imgPreloadCloseButton = new Image();

	// if close button image found, 
	imgPreloadCloseButton.onload=function(){

		var objCloseButton = document.createElement("img");
		objCloseButton.src = closeButton;
		objCloseButton.setAttribute('id','closeButton');
		objCloseButton.style.position = 'absolute';
		objCloseButton.style.zIndex = '200';
		objLink.appendChild(objCloseButton);

		return false;
	}

	imgPreloadCloseButton.src = closeButton;

	// create image
	var objImage = document.createElement("img");
	objImage.setAttribute('id','lightboxImage');
	objLink.appendChild(objImage);
	
	// create details div, a container for the caption and keyboard message
	var objLightboxDetails = document.createElement("div");
	objLightboxDetails.setAttribute('id','lightboxDetails');
	objLightbox.appendChild(objLightboxDetails);

	// create caption
	var objCaption = document.createElement("div");
	objCaption.setAttribute('id','lightboxCaption');
	objCaption.style.display = 'none';
	objLightboxDetails.appendChild(objCaption);

	// create keyboard message
	var objKeyboardMsg = document.createElement("div");
	objKeyboardMsg.setAttribute('id','keyboardMsg');
	objKeyboardMsg.innerHTML = 'press <kbd>x</kbd> to close';
	objLightboxDetails.appendChild(objKeyboardMsg);


}




//
// addLoadEvent()
// Adds event to window.onload without overwriting currently assigned onload functions.
// Function found at Simon Willison's weblog - http://simon.incutio.com/
//
function addLoadEvent(func)
{	
	var oldonload = window.onload;
	if (typeof window.onload != 'function'){
    	window.onload = func;
	} else {
		window.onload = function(){
		oldonload();
		func();
		}
	}

}
addLoadEvent(initLightbox);	// run initLightbox onLoad


function inElement(obj, event){
	
	if(!obj){
		return false;
	}
	
	var pos = getCursorPosition(event)
	var coor = getObjPosition(obj)	
	if(pos.x+1 <= coor.x || pos.x -1 >= coor.x + obj.clientWidth){		
		return false
	}
	if(pos.y+1 <= coor.y || pos.y - 1 >= coor.y + obj.clientHeight){		
		return false
	}
	
	return true;
}


function getObjPosition(element) {
	var r = { x: element.offsetLeft, y: element.offsetTop };
	if (element.offsetParent) {
		var tmp = getObjPosition(element.offsetParent);
		r.x += tmp.x;
		r.y += tmp.y;
	}
	return r;
};


function getCursorPosition(e) {
    e = e || window.event;
    var cursor = {x:0, y:0};
    if (e.pageX || e.pageY) {
        cursor.x = e.pageX;
        cursor.y = e.pageY;
    } 
    else {
        var de = document.documentElement;
        var b = document.body;
        cursor.x = e.clientX + 
            (de.scrollLeft || b.scrollLeft) - (de.clientLeft || 0);
        cursor.y = e.clientY + 
            (de.scrollTop || b.scrollTop) - (de.clientTop || 0);
    }
    return cursor;
}
function initPreview(){
		/**
		*
		*
		*/

		var ie = document.all ? true : false
		
		var mediumImageObj = document.getElementById(mediumImageId)
		if(maxMediumHeight != -1 || maxMediumWidth != -1){
			//creating table
			var table = document.createElement("table")
			table.setAttribute("cellPadding", 0)
			table.setAttribute("cellSpacing", 0)
			tbody = document.createElement("tbody")
			var tr = document.createElement("tr")
			tr.setAttribute("valign", "middle")
			
			var td = document.createElement("td")
			td.setAttribute("align", "center")
			mediumImageClone = mediumImageObj.cloneNode(mediumImageObj)
			td.appendChild(mediumImageClone)
			tr.appendChild(td)
			tbody.appendChild(tr)
			table.appendChild(tbody)
			mediumImageObj.parentNode.insertBefore(table, mediumImageObj)
			mediumImageObj.parentNode.removeChild(mediumImageObj)
			mediumImageObj = mediumImageClone

			if(maxMediumHeight != -1){
				table.style.height = maxMediumHeight + "px"
			}
			if(maxMediumWidth != -1){
				table.style.width = maxMediumWidth + "px"
			}
		}
		
		
		mediumImageObj.style.cursor = "pointer"
		
		var smallImages = new Array()
		if(containerSmallImagesId){
			var contanerObj = document.getElementById(containerSmallImagesId)
			var smallImages = contanerObj.getElementsByTagName("img")
		}else{
			var allImages = document.getElementsByTagName("img")			
			for(var i = 0; i< allImages.length; i++){			
				if(allImages[i].getAttribute("lightbox") == "true"){				
					allImages[i].style.cursor = "pointer"
					allImages[i].onclick = showLargeImage
					smallImages[smallImages.length] = allImages[i]			
				}
			}
		}
		
		var mediumImagesNames = new Array(smallImages.length)
		bigImagesNames = new Array(smallImages.length)
		XLImagesNames = new Array(smallImages.length)
		
		var preloadImage = new Image();
		
		for(var i = 0; i< smallImages.length; i++){
			smallImages[i].onclick = showLargeImageExtern;
			mediumImagesNames[i] = smallImages[i].src.replace(smallPrefix, mediumPrefix)
			bigImagesNames[i] = smallImages[i].src.replace(smallPrefix, largePrefix)
			XLImagesNames[i] = smallImages[i].src.replace(smallPrefix, hugePrefix)			
			preloadImage.src = mediumImagesNames[i]
		}		
		
		smallImageMouseOver = function(obj){
			var index = obj.getAttribute("index")
			mediumImageObj.setAttribute("index", index) 
			mediumImageObj.src = mediumImagesNames[index]
			var bigImage = new Image()
			bigImage.src = bigImagesNames[index]
			
			if(showZoom){
				var xlImage = new Image()
				xlImage.src = XLImagesNames[index]
			}
		}
		
		

		for(var i = 0; i< smallImages.length; i++){
			smallImages[i].setAttribute("index", i)
			if(ie){				
				smallImages[i].onmouseover = function(){smallImageMouseOver(this)}
			}else{
				smallImages[i].setAttribute("onmouseover", "smallImageMouseOver(this);")
			}
		}
		
		mediumImageObj.setAttribute("index", 0)
		mediumImageObj.onclick = showLargeImage;
	}
	function showLargeImage(){
		if(showZoom){
			loadedXLIMage = false;
			var index = this.getAttribute("index")
			var xlimage = document.getElementById("xlimage")
			
			xlimage.src = loadingImage
			xlimage.style.top = "120px"
			xlimage.style.left = "50px"
			
			var XLImageLoading = new Image()
			XLImageLoading.onload = function(){
				loadedXLIMage = true				
				var xlimage = document.getElementById("xlimage")
				xlimage.src = XLImagesNames[index]				
				xlimage.style.top = "0px"
				xlimage.style.left = "0px"
				var zoom = 250*document.getElementById("lightboxImage").clientWidth/xlimage.clientWidth
				if(!zoom){
					zoomframeLoadedSizes = false
				}else{
					zoomframeLoadedSizes = true
				}
				zoomframeWidth = zoom
				zoomframeHeight = zoom
					
			}
			XLImageLoading.src = XLImagesNames[index]
		}			
		showLightbox(this); 
		return false;		
	}

	function showLargeImageExtern(){
		obj = document.getElementById(mediumImageId)
		if(showZoom){
			loadedXLIMage = false;
			var index = obj.getAttribute("index")
			var xlimage = document.getElementById("xlimage")
			
			xlimage.src = loadingImage
			xlimage.style.top = "120px"
			xlimage.style.left = "50px"
			
			var XLImageLoading = new Image()
			XLImageLoading.onload = function(){
				loadedXLIMage = true				
				var xlimage = document.getElementById("xlimage")
				xlimage.src = XLImagesNames[index]				
				xlimage.style.top = "0px"
				xlimage.style.left = "0px"
				var zoom = 250*document.getElementById("lightboxImage").clientWidth/xlimage.clientWidth
				if(!zoom){
					zoomframeLoadedSizes = false
				}else{
					zoomframeLoadedSizes = true
				}
				zoomframeWidth = zoom
				zoomframeHeight = zoom
					
			}
			XLImageLoading.src = XLImagesNames[index]
		}			
		showLightbox(obj); 
		return false;		
	}

	
	var zoomframeWidth = 125
	var zoomframeHeight = 125
	var loadedXLIMage = false
	var zoomframeLoadedSizes = false
	addLoadEvent(initPreview);	// run initLightbox onLoad