//
// Configuration
//

// If you would like to use a custom loading image or close button reference them in the next two lines.
var loadingImage = '/images/lightbox/loading.gif';		
var closeButton = '/images/close2.jpg';		


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

	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_div()
// Returns array with page width, height and window width, height
// Core code from - quirksmode.org
// Edit for Firefox by pHaez
//
function getPageSize_div(){
	
	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_div(); }
}


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

//
// showLightbox_div()
// Preloads images. Pleaces new image in lightbox then centers and displays.
//
function showLightbox_div(objLink)
{
	// prep objects
	var objOverlay = document.getElementById('overlay_div');
	var objLightbox = document.getElementById('lightbox_div');
	var objCaption = document.getElementById('lightboxCaption_div');
	var objDiv = document.getElementById('lightboxDiv_div');
	var objLoadingImage = document.getElementById('loadingImage_div');
	var objLightboxDetails = document.getElementById('lightboxDetails_div');

	
	var arrayPageSize = getPageSize_div();
	var arrayPageScroll = getPageScroll_div();

	// 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';

		var str_divid = objLink.getAttribute('href');
		var int_pindex = str_divid.indexOf( "#" );
		str_divid = str_divid.substring( int_pindex , str_divid.length );
		str_divid = str_divid.replace("#", "");
		var obj_div = document.getElementById( str_divid );
		if( obj_div )
		{
			
			var lightboxTop = arrayPageScroll[1] + ((arrayPageSize[3] - 35 - obj_div.style.height.replace("px","")) / 2);
			var lightboxLeft = ((arrayPageSize[0] - 20 - obj_div.style.width.replace("px","")) / 2);
			objLightbox.style.top = (lightboxTop < 0) ? "0px" : lightboxTop + "px";
			objLightbox.style.left = (lightboxLeft < 0) ? "0px" : lightboxLeft + "px";
			objLightbox.style.width = obj_div.style.width;
			objDiv.style.width = obj_div.style.width;
			objLightboxDetails.style.width = obj_div.style.width;// + 'px';
			
			//			objDiv.innerHTML = obj_div.innerHTML;
			this.sourceDiv = obj_div;
			while( this.sourceDiv.childNodes.length > 0 )
			{
					var node = obj_div.childNodes[0];
					obj_div.removeChild(obj_div.childNodes[0]);
					objDiv.appendChild(node);
			}
		
			if(objLink.getAttribute('title')){
				objCaption.style.display = 'block';
				//objCaption.style.width = imgPreload.width + 'px';
				objCaption.innerHTML = objLink.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'; }
	
			if (typeof document.body.style.maxHeight == "undefined") {  // if ie6
						// Hide select boxes as they will 'peek' through the image in IE
						selects = document.getElementsByTagName("select");
						for (i = 0; i != selects.length; i++) {
								if( selects[i].rel != "nohide" )
									selects[i].style.visibility = "hidden";
						}
			}
			

		
			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_div();
			objOverlay.style.height = (arrayPageSize[1] + 'px');
			
			// Check for 'x' keypress
			listenKey();
		}
}





//
// hideLightbox_div()
//
function hideLightbox_div()
{
	// get objects
	objOverlay = document.getElementById('overlay_div');
	objLightbox = document.getElementById('lightbox_div');
	var objDiv = document.getElementById('lightboxDiv_div');

	// hide lightbox and overlay
	objOverlay.style.display = 'none';
	objLightbox.style.display = 'none';

	// make select boxes visible
	selects = document.getElementsByTagName("select");
    for (i = 0; i != selects.length; i++) {
		selects[i].style.visibility = "visible";
	}
	
	//remove child elements from contents div
	/*while( objDiv.childNodes.length > 0 ) {
		objDiv.removeChild(objDiv.childNodes[0]);
	}*/
	while( objDiv.childNodes.length > 0 )
	{
			var node = objDiv.childNodes[0];
			objDiv.removeChild(objDiv.childNodes[0]);
			this.sourceDiv.appendChild(node);
	}
	// disable keypress listener
	document.onkeypress = '';
}




//
// initLightbox_div()
// 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_div()
{
	
	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_div")){
			anchor.onclick = function () {showLightbox_div(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_div(); return false;"><img id="loadingImage" /></a>
	//	</div>
	// <div id="lightbox">
	//		<a href="#" onclick="hideLightbox_div(); 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>
	
	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_div');
	objOverlay.onclick = function () {hideLightbox_div(); 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_div();
	var arrayPageScroll = getPageScroll_div();

	// 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_div(); return false;}
		objOverlay.appendChild(objLoadingImageLink);
		
		var objLoadingImage = document.createElement("img");
		objLoadingImage.src = loadingImage;
		objLoadingImage.setAttribute('id','loadingImage_div');
		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_div');
	objLightbox.style.display = 'none';
	objLightbox.style.position = 'absolute';
	objLightbox.style.zIndex = '100';	
	objBody.insertBefore(objLightbox, objOverlay.nextSibling);
	
	// create image
	var objDiv = document.createElement("div");
	objDiv.setAttribute('id','lightboxDiv_div');
	objLightbox.appendChild(objDiv);
	
	// create link
	var objLink = document.createElement("a");
	objLink.setAttribute('href','#');
	objLink.setAttribute('title','Click to close');
	objLink.onclick = function () {hideLightbox_div(); 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_div');
		objCloseButton.style.position = 'absolute';
		objCloseButton.style.zIndex = '200';
		objLink.appendChild(objCloseButton);

		return false;
	}

	imgPreloadCloseButton.src = closeButton;

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

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

	// create keyboard message
	/*
	var objKeyboardMsg = document.createElement("div");
	objKeyboardMsg.setAttribute('id','keyboardMsg_div');
	objKeyboardMsg.innerHTML = 'Press <a href="#" onclick="hideLightbox_div(); return false;"><kbd>x</kbd></a> 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_div);	// run initLightbox onLoad