/*
	Iframe lightbox script by Øyvind Smestad, based on:

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

*/


//
// 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;
	}
}
	

//
// showLightbox()
//
function showLightbox(objLink)
{
	// prep objects
	var objOverlay = document.getElementById('overlay');
	var objLightbox = document.getElementById('lightbox');
	var objIframe = document.getElementById('externalResourceWindow');
	
	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();

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

	// set Iframe properties
	objIframe.src = objLink.href;
	
	//TODO unobrusivly attach hideLightbox to the close button in the Lightbox

	// 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 - 465) / 2);
	var lightboxLeft = ((arrayPageSize[0] - 20 - 936) / 2);
	
	objLightbox.style.top = (lightboxTop < 0) ? "0px" : lightboxTop + "px";
	objLightbox.style.left = (lightboxLeft < 0) ? "0px" : lightboxLeft + "px";
	
	// 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);
	}

	// Hide select boxes as they will 'peek' through in IE
	selects = document.getElementsByTagName("select");
	for (i = 0; i != selects.length; i++) {
			selects[i].style.visibility = "hidden";
	}

	objLightbox.style.display = 'block';

	return false;
}


//
// hideLightbox()
//
function hideLightbox()
{
	// get objects
	objOverlay = document.getElementById('overlay');
	objLightbox = document.getElementById('lightbox');

	// 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";
	}
}


//
// 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 iframe.
//
function initLightbox()
{
	
	if (!document.getElementsByTagName){ return; }
	var anchors = document.getElementsByTagName("a");
	
	var hasLightboxes = false;

	// 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;}
			hasLightboxes = true;
		}
	}

	if(hasLightboxes) {
		// the rest of this code inserts html at the top of the page
		
		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();

		// 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';	
		objBody.insertBefore(objLightbox, objOverlay.nextSibling);
		
		// create iframe
		var iframe = document.createElement('iframe');
		iframe.id = 'externalResourceWindow';
		iframe.name = 'externalResourceWindow';
		iframe.frameBorder = '0';
		iframe.scrolling = 'no';
		iframe.style.height = '465px';
		iframe.style.width = '936px';
		iframe.allowTransparency = 'true';
		objLightbox.appendChild(iframe);
	}
}


// sniff IE version
function vIE(){return (navigator.appName=='Microsoft Internet Explorer')?parseFloat((new RegExp("MSIE ([0-9]{1,}[.0-9]{0,})")).exec(navigator.userAgent)[1]):-1;}

// find element top
function pageY(elem) {
	// See if we are at the root
	if (elem.parentNode) {	
		// If we can still go up, recurse
		return (isNaN(parseInt(elem.offsetTop)) ? 0 : parseInt(elem.offsetTop) + pageY(elem.parentNode));
	} else {
		// Else just get current
		return isNaN(parseInt(elem.offsetTop)) ? 0 : parseInt(elem.offsetTop);
	}
}

// find element left
function pageX(elem) {
	// See if we are at the root
	if (elem.parentNode) {	
		// If we can still go up, recurse
		return (isNaN(parseInt(elem.offsetLeft)) ? 0 : parseInt(elem.offsetLeft) + pageX(elem.parentNode));
	} else {
		// Else just get current
		return isNaN(parseInt(elem.offsetLeft)) ? 0 : parseInt(elem.offsetLeft);
	}
}

/* For inline Div lightbox */
function ShowOverlay()
{
	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();

	// set height of Overlay to take up whole page and show
	document.getElementById("Poverlay").style.height = (arrayPageSize[1] + 'px');

	// center lightbox and make sure that the top and left values are not negative
	var lightboxTop = 100;
	var lightboxLeft = ((arrayPageSize[0] - 936) / 2);
	
	document.getElementById("Poverlay_container").style.top = (lightboxTop < 0) ? "0px" : lightboxTop + "px";
	document.getElementById("Poverlay_container").style.left = (lightboxLeft < 0) ? "0px" : lightboxLeft + "px";
	
    document.getElementById("Poverlay").style.display = "block";
    document.getElementById("Poverlay_container").style.display = "block";
    
    if ((vIE() > 0) && (vIE() < 7)) { //is IE and older than IE7
		document.getElementById("Poverlay_container").style.top = 0 + "px";
		document.getElementById("Poverlay_container").style.left = 0 + "px";
        document.getElementById("Poverlay_container").style.position = 'absolute';
		
        document.getElementById("Poverlay").style.position = 'absolute';
        document.getElementById("Poverlay").style.width = (arrayPageSize[0] - 5) + 'px';
		document.getElementById("Poverlay").style.top = -pageY(document.getElementById("main_content")) + 'px';
        document.getElementById("Poverlay").style.left = -pageX(document.getElementById("main_content")) + 'px';
      }
 }
 
 function HideOverlay()
 {
    document.getElementById("Poverlay").style.display = "none";
	document.getElementById("Poverlay_container").style.display = "none";
 }