/**
 * Lightbox JS: Fullsize Image Overlays by Lokesh Dhakar - http://www.huddletogether.com
 * For more information on this script, visit: http://www.huddletogether.com/projects/lightbox/
 *
 * Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
**/

var loadingImage = '/shared/img/lightbox-loading.gif';
var closeButton = '/shared/img/lightbox-close.gif';

function getPageScroll()
{
	if(self.pageYOffset)
	{
		return self.pageYOffset;
	}
	else if(document.documentElement && document.documentElement.scrollTop)
	{
		return document.documentElement.scrollTop;
	}
	else if(document.body)
	{
		return document.body.scrollTop;
	}
	else
	{
		return 0;
	}
}

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)
	{
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	}
	else
	{
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}
	var windowWidth, windowHeight;
	if(self.innerHeight)
	{
		windowWidth = self.innerWidth;
		windowHeight = self.innerHeight;
	}
	else if(document.documentElement && document.documentElement.clientHeight)
	{
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
	}
	else if(document.body)
	{
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
	}
	if(yScroll < windowHeight)
	{
		pageHeight = windowHeight;
	}
	else
	{
		pageHeight = yScroll;
	}
	if(xScroll < windowWidth)
	{
		pageWidth = windowWidth;
	}
	else
	{
		pageWidth = xScroll;
	}
	return [pageWidth, pageHeight, windowWidth, windowHeight];
}

function showLightbox(uri)
{
	var objOverlay = document.getElementById('overlay');
	var objLightbox = document.getElementById('lightbox');
	var objImage = document.getElementById('lightboxImage');
	var objLoadingImage = document.getElementById('loadingImage');
	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();
	if(objLoadingImage)
	{
		objLoadingImage.style.top = (arrayPageScroll + ((arrayPageSize[3] - 35 - objLoadingImage.height) / 2) + 'px');
		objLoadingImage.style.left = (((arrayPageSize[0] - 20 - objLoadingImage.width) / 2) + 'px');
		objLoadingImage.style.display = 'block';
	}
	objOverlay.style.height = (arrayPageSize[1] + 'px');
	objOverlay.style.display = 'block';
	imgPreload = new Image();
	imgPreload.onload = function()
	{
		objImage.src = uri;
		var lightboxTop = arrayPageScroll + ((arrayPageSize[3] - imgPreload.height) / 2);
		var lightboxLeft = ((arrayPageSize[0] - 20 - imgPreload.width) / 2);
		objLightbox.style.top = (lightboxTop < 0) ? '0px' : lightboxTop + 'px';
		objLightbox.style.left = (lightboxLeft < 0) ? '0px' : lightboxLeft + 'px';
		if(navigator.appVersion.indexOf('MSIE') != -1)
		{
			var exitTime = (new Date()).getTime() + 250;
			while(true)
			{
				if((new Date()).getTime() > exitTime)
				{
					break;
				}
			}
		}
		if(objLoadingImage)
		{
			objLoadingImage.style.display = 'none';
		}
		for(i in selects = document.getElementsByTagName('select'))
		{
			if(selects[i].style)
			{
				selects[i].style.visibility = 'hidden';
			}
		}
		objLightbox.style.display = 'block';
		arrayPageSize = getPageSize();
		objOverlay.style.height = (arrayPageSize[1] + 'px');
		return false;
	}
	imgPreload.src = uri;
}

function hideLightbox()
{
	objOverlay = document.getElementById('overlay');
	objLightbox = document.getElementById('lightbox');
	objOverlay.style.display = 'none';
	objLightbox.style.display = 'none';
	for(i in selects = document.getElementsByTagName('select'))
	{
		if(selects[i].style)
		{
			selects[i].style.visibility = 'visible';
		}
	}
}

function initLightbox()
{
	if (!document.getElementsByTagName) return;
	var objBody = document.getElementsByTagName('body')[0];
	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.appendChild(objOverlay);
	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();
	var imgPreloader = new Image();
	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 = '';
		return false;
	}
	imgPreloader.src = loadingImage;
	var objLightbox = document.createElement('div');
	objLightbox.setAttribute('id','lightbox');
	objLightbox.style.display = 'none';
	objLightbox.style.position = 'absolute';
	objLightbox.style.zIndex = '100';
	objBody.appendChild(objLightbox);
	var objLink = document.createElement('a');
	objLink.setAttribute('href','#');
	objLink.setAttribute('title','Click to close');
	objLink.onclick = function()
	{
		hideLightbox();
		return false;
	}
	objLightbox.appendChild(objLink);
	var imgPreloadCloseButton = new Image();
	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;
	var objImage = document.createElement('img');
	objImage.setAttribute('id','lightboxImage');
	objLink.appendChild(objImage);
}