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

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

	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 = 'http://radar.oreilly.com/images/loading.gif';		
var closeButton = 'http://radar.oreilly.com/images/close.gif';		





//
// 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 ( _proxy_jslib_handle(document, 'body', '', 0, 0)) {// all other Explorers
		yScroll =  _proxy_jslib_handle(document, 'body', '', 0, 0).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 =  _proxy_jslib_handle(document, 'body', '', 0, 0).scrollWidth;		
		yScroll = window.innerHeight + window.scrollMaxY;
	} else if ( _proxy_jslib_handle(document, 'body', '', 0, 0).scrollHeight >  _proxy_jslib_handle(document, 'body', '', 0, 0).offsetHeight){ // all but Explorer Mac
		xScroll =  _proxy_jslib_handle(document, 'body', '', 0, 0).scrollWidth;
		yScroll =  _proxy_jslib_handle(document, 'body', '', 0, 0).scrollHeight;
	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
		xScroll =  _proxy_jslib_handle(document, 'body', '', 0, 0).offsetWidth;
		yScroll =  _proxy_jslib_handle(document, 'body', '', 0, 0).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 ( _proxy_jslib_handle(document, 'body', '', 0, 0)) { // other Explorers
		windowWidth =  _proxy_jslib_handle(document, 'body', '', 0, 0).clientWidth;
		windowHeight =  _proxy_jslib_handle(document, 'body', '', 0, 0).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;
	}
	
	if (pageWidth > 1020) {
		pageWidth = 1020;	
	}


	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 () {	document.onkeypress = getKey; }
	

//
// showLightbox()
// Preloads images. Pleaces new image in lightbox then centers and displays.
//
function showLightbox(objLink) {
	
	// prep objects
	var objOverlay =  _proxy_jslib_handle(document, 'getElementById', '', 1, 0)('overlay');
	var objLightbox =  _proxy_jslib_handle(document, 'getElementById', '', 1, 0)('lightbox');
	var objCaption =  _proxy_jslib_handle(document, 'getElementById', '', 1, 0)('lightboxCaption');
	var objImage =  _proxy_jslib_handle(document, 'getElementById', '', 1, 0)('lightboxImage');
	var objLoadingImage =  _proxy_jslib_handle(document, 'getElementById', '', 1, 0)('loadingImage');
	var objLightboxDetails =  _proxy_jslib_handle(document, 'getElementById', '', 1, 0)('lightboxDetails');

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

	// center loadingImage if it exists
	if (objLoadingImage) {
		 _proxy_jslib_assign('', 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() {
		 _proxy_jslib_assign('', objImage, 'src', '=', (  _proxy_jslib_handle(objLink, 'href', '', 0, 0)));

		// 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);
		
		 _proxy_jslib_assign('', objLightbox.style, 'top', '=', ( (lightboxTop < 0) ? "0px" : lightboxTop + "px"));
		objLightbox.style.left = (lightboxLeft < 0) ? "0px" : lightboxLeft + "px";


		objLightboxDetails.style.width = imgPreload.width + 'px';
		
		if(objLink.getAttribute('title')){
			objCaption.style.display = 'block';
			//objCaption.style.width = imgPreload.width + 'px';
			 _proxy_jslib_assign('', 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'; }

		// Hide select boxes as they will 'peek' through the image in IE
		selects =  _proxy_jslib_handle(document, 'getElementsByTagName', '', 1, 0)("select");
        for (i = 0; i != selects.length; i++) {
                 _proxy_jslib_handle(selects, (i), 0, 0).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();
		objOverlay.style.height = (arrayPageSize[1] + 'px');
		
		// Check for 'x' keypress
		listenKey();

		return false;
	}

	 _proxy_jslib_assign('', imgPreload, 'src', '=', (  _proxy_jslib_handle(objLink, 'href', '', 0, 0)));
	
	
}




//
// flashLightbox()
// Preloads images. Pleaces new image in lightbox then centers and displays.
//
function flashLightbox(imgURL,flashTitle, photoUrl) {
	
	
	// prep objects
	var objOverlay =  _proxy_jslib_handle(document, 'getElementById', '', 1, 0)('overlay');
	var objLightbox =  _proxy_jslib_handle(document, 'getElementById', '', 1, 0)('lightbox');
	var objCaption =  _proxy_jslib_handle(document, 'getElementById', '', 1, 0)('lightboxCaption');
	var objPhotoLink =  _proxy_jslib_handle(document, 'getElementById', '', 1, 0)('lightboxPhotoLink');
	var objImage =  _proxy_jslib_handle(document, 'getElementById', '', 1, 0)('lightboxImage');
	var objLoadingImage =  _proxy_jslib_handle(document, 'getElementById', '', 1, 0)('loadingImage');
	var objLightboxDetails =  _proxy_jslib_handle(document, 'getElementById', '', 1, 0)('lightboxDetails');

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

	// center loadingImage if it exists
	if (objLoadingImage) {
		 _proxy_jslib_assign('', 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)();
	
	
	 _proxy_jslib_handle(document, 'getElementById', '', 1, 0)('photo_feed').style.visibility = 'hidden';

	imgPreload.onload=function() {
		 _proxy_jslib_assign('', objImage, 'src', '=', ( imgURL));

		// 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);
		
		 _proxy_jslib_assign('', objLightbox.style, 'top', '=', ( (lightboxTop < 0) ? "0px" : lightboxTop + "px"));
		objLightbox.style.left = (lightboxLeft < 0) ? "0px" : lightboxLeft + "px";


		objLightboxDetails.style.width = imgPreload.width + 'px';
		
		// A small addition to allow a link from the photo
		if (photoUrl!=undefined){
			 _proxy_jslib_handle(objPhotoLink, 'setAttribute', '', 1, 0)('href',photoUrl);
			 _proxy_jslib_handle(objPhotoLink, 'setAttribute', '', 1, 0)('title','go to flickr');
		}
		else {
			 _proxy_jslib_handle(objPhotoLink, 'setAttribute', '', 1, 0)('href','#');
			 _proxy_jslib_handle(objPhotoLink, 'setAttribute', '', 1, 0)('title','');
		}
			
			
		
		if(flashTitle!=undefined){
			objCaption.style.display = 'block';
			//objCaption.style.width = imgPreload.width + 'px';
			 _proxy_jslib_assign('', objCaption, 'innerHTML', '=', ( flashTitle));
		} 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(260);
		} 

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

		// Hide select boxes as they will 'peek' through the image in IE
		selects =  _proxy_jslib_handle(document, 'getElementsByTagName', '', 1, 0)("select");
        for (i = 0; i != selects.length; i++) {
                 _proxy_jslib_handle(selects, (i), 0, 0).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();
		objOverlay.style.height = (arrayPageSize[1] + 'px');
		
		// Check for 'x' keypress
		listenKey();

		return false;
	}

	 _proxy_jslib_assign('', imgPreload, 'src', '=', ( imgURL));
	
}





//
// hideLightbox()
//
function hideLightbox() {
	// get objects
	objOverlay =  _proxy_jslib_handle(document, 'getElementById', '', 1, 0)('overlay');
	objLightbox =  _proxy_jslib_handle(document, 'getElementById', '', 1, 0)('lightbox');

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

	// make select boxes visible
	selects =  _proxy_jslib_handle(document, 'getElementsByTagName', '', 1, 0)("select");
    for (i = 0; i != selects.length; i++) {
		 _proxy_jslib_handle(selects, (i), 0, 0).style.visibility = "visible";
	}
	
	
	 _proxy_jslib_handle(document, 'getElementById', '', 1, 0)('photo_feed').style.visibility = 'visible';

}




//
// 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 (! _proxy_jslib_handle(document, 'getElementsByTagName', '', 0, 0)){ return; }
	var anchors =  _proxy_jslib_handle(document, 'getElementsByTagName', '', 1, 0)("a");

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

		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>
	
	
	var objBody =  _proxy_jslib_handle(document, 'getElementsByTagName', '', 1, 0)("div").item(1);
	
	// create overlay div and hardcode some functional styles (aesthetic styles are in CSS file)
	var objOverlay = document.createElement("div");
	 _proxy_jslib_handle(objOverlay, 'setAttribute', '', 1, 0)('id','overlay');
	objOverlay.onclick = function () {hideLightbox(); return false;}
	objOverlay.style.display = 'none';
	objOverlay.style.position = 'absolute';
	 _proxy_jslib_assign('', 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");
		 _proxy_jslib_handle(objLoadingImageLink, 'setAttribute', '', 1, 0)('href','#');
		//objLoadingImageLink.onclick = function () {hideLightbox(); return false;}
		objOverlay.appendChild(objLoadingImageLink);
		
		var objLoadingImage = document.createElement("img");
		 _proxy_jslib_assign('', objLoadingImage, 'src', '=', ( loadingImage));
		 _proxy_jslib_handle(objLoadingImage, 'setAttribute', '', 1, 0)('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;
	}

	 _proxy_jslib_assign('', imgPreloader, 'src', '=', ( loadingImage));

	// create lightbox div, same note about styles as above
	var objLightbox = document.createElement("div");
	 _proxy_jslib_handle(objLightbox, 'setAttribute', '', 1, 0)('id','lightbox');
	objLightbox.style.display = 'none';
	objLightbox.style.position = 'absolute';
	objLightbox.style.zIndex = '100';	
	objBody.insertBefore(objLightbox, objOverlay.nextSibling);
	
	// create link
	var objLink = document.createElement("a");
	 _proxy_jslib_handle(objLink, 'setAttribute', '', 1, 0)('href','#');
	 _proxy_jslib_handle(objLink, 'setAttribute', '', 1, 0)('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");
		 _proxy_jslib_assign('', objCloseButton, 'src', '=', ( closeButton));
		 _proxy_jslib_handle(objCloseButton, 'setAttribute', '', 1, 0)('id','closeButton');
		objCloseButton.style.position = 'absolute';
		objCloseButton.style.zIndex = '200';
		objLink.appendChild(objCloseButton);

		return false;
	}

	 _proxy_jslib_assign('', imgPreloadCloseButton, 'src', '=', ( closeButton));

	var objPhotoLink = document.createElement("a");
	 _proxy_jslib_handle(objPhotoLink, 'setAttribute', '', 1, 0)('id','lightboxPhotoLink');
	objLightbox.appendChild(objPhotoLink);

	// create image
	var objImage = document.createElement("img");
	 _proxy_jslib_handle(objImage, 'setAttribute', '', 1, 0)('id','lightboxImage');
	objPhotoLink.appendChild(objImage);
	
	// create details div, a container for the caption and keyboard message
	var objLightboxDetails = document.createElement("div");
	 _proxy_jslib_handle(objLightboxDetails, 'setAttribute', '', 1, 0)('id','lightboxDetails');
	objLightbox.appendChild(objLightboxDetails);
	
	// create caption
	var objCaption = document.createElement("div");
	 _proxy_jslib_handle(objCaption, 'setAttribute', '', 1, 0)('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 ;
_proxy_jslib_flush_write_buffers() ;