//
// 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;
	}	
	
	if(yScroll < windowHeight){
		pageHeight = windowHeight;
	} else { 
		pageHeight = yScroll;
	}

	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;
	}
}

// add esc, onkeydown

function getKey(e){
	if (e == null) { // ie
		keycode = event.keyCode;
	} else { // mozilla
		keycode = e.which;
	}
	if(keycode == '27' || keycode == '88' ){ hideLightbox(); 
	}
}

function listenKey () {	document.onkeydown = getKey; }

//Set to variables by php script

function showLightbox(objLink)
{
	var objOverlay = document.getElementById('overlay');
	var objLightbox = document.getElementById('overlaybox');
	var objCaption = document.getElementById('olCaption');
	var objImage = document.getElementById('olImage');
	var objLoadingImage = document.getElementById('loadingImage');
	var objLightboxDetails = document.getElementById('olDetails');
	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();
	
	//add flexible height, weight, set global through users 
	varsearch =objLink.search;
	linkvar = new Array();
	
	if (varsearch != '')
	{
	  varsearch = varsearch.substr(1, varsearch.length - 1);
	  varsearch = varsearch.replace(/%26/,'&');
	  varsplit = varsearch.split('&');
	
	  for (i = 0; i < varsplit.length; i++)
	  {
	  varsplit[i] = varsplit[i].split('=');
	  linkvar[varsplit[i][0]] = varsplit[i][1];
	  }
	} 
	 
	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';
	}

	objOverlay.style.background= 'url('+ olImage + ')';
	objOverlay.style.height = (arrayPageSize[1] + 'px');
	objOverlay.style.display = 'block';
 	
	imgPreload = new Image();
	imgPreload.onload=function(){

		objImage.src = objLink.href;

		var imageHeight= linkvar['ph'];
		var imageWidth= linkvar['pw'];
		
		objImage.style.width = imageWidth + 'px';
		objImage.style.height = imageHeight + 'px';		
		
		var lightboxTop = arrayPageScroll[1] + ((arrayPageSize[3] - 35 - imageHeight) / 2);
		var lightboxLeft = ((arrayPageSize[0] - 20 - imageWidth) / 2);
		
		objLightbox.style.top = (lightboxTop < 0) ? "0px" : lightboxTop + "px";
		objLightbox.style.left = (lightboxLeft < 0) ? "0px" : lightboxLeft + "px";

		if ( Number(imageWidth) < Number(minWidth)) {
			objLightboxDetails.style.width = minWidth + 'px';
		
		} else {
			objLightboxDetails.style.width = imageWidth + 'px';
		}
		
		if(objLink.getAttribute('title' )){
			objCaption.innerHTML = objLink.getAttribute('title');
		}

		if (showText == 'false') {
			if (showText == 'false' && showClose == 'false') {
				objCaption.style.display = 'none';
				objLightboxDetails.style.height = '10px';
			} else {
				objCaption.style.display = 'none';			
			}
		} else {
			objCaption.style.display = 'block';
		}		

		if (navigator.appVersion.indexOf("MSIE")!=-1){
			pause(250);
		} 

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

		selects = document.getElementsByTagName("select");
        for (i = 0; i != selects.length; i++) {
                selects[i].style.visibility = "hidden";
        }

		objLightbox.style.display = 'block';

		arrayPageSize = getPageSize();
		objOverlay.style.height = (arrayPageSize[1] + 'px');
		listenKey();
		return false;
	}

	imgPreload.src = objLink.href;
}


//
// hideLightbox()
//
function hideLightbox()
{
	objOverlay = document.getElementById('overlay');
	objLightbox = document.getElementById('overlaybox');
	objOverlay.style.display = 'none';
	objLightbox.style.display = 'none';
	selects = document.getElementsByTagName("select");
    	for (i = 0; i != selects.length; i++) {
		selects[i].style.visibility = "visible";
	}
	document.onkeypress = '';
}

function initOverlay()
{
	
	if (!document.getElementsByTagName){ return; }
	var anchors = document.getElementsByTagName("a");

	for (var i=0; i<anchors.length; i++){
		var anchor = anchors[i];

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

	var objBody = document.getElementsByTagName("body").item(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.insertBefore(objOverlay, objBody.firstChild);
	
	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=function(){};

	return false;
	}

	imgPreloader.src = loadingImage;

	var objLightbox = document.createElement("div");
	objLightbox.setAttribute('id','overlaybox');
	objLightbox.style.display = 'none';
	objLightbox.style.position = 'absolute';
	objLightbox.style.zIndex = '100';	
	objBody.insertBefore(objLightbox, objOverlay.nextSibling);
	
	var objLink = document.createElement("a");
	objLink.setAttribute('href','#');
	objLink.setAttribute('title',closeText);
	objLink.onclick = function () {hideLightbox(); return false;}
	objLightbox.appendChild(objLink);

	var objImage = document.createElement("img");
	objImage.setAttribute('id','olImage');
	objLink.appendChild(objImage);
	
	var objLightboxDetails = document.createElement("div");
	objLightboxDetails.setAttribute('id','olDetails');
	objLightbox.appendChild(objLightboxDetails);
	
	var objCaption = document.createElement("div");
	objCaption.setAttribute('id','olCaption');
	objCaption.style.display = 'none';
	objLightboxDetails.appendChild(objCaption);

	if (showClose == 'true') {
		var objKeyboardMsg = document.createElement("div");
		objKeyboardMsg.setAttribute('id','keyMsg');
		objKeyboardMsg.innerHTML = msgText;
		objLightboxDetails.appendChild(objKeyboardMsg);
	}

}


function addLoadEvent(func)
{	
	var oldonload = window.onload;
	if (typeof window.onload != 'function'){
    	window.onload = func;
	} else {
		window.onload = function(){
		oldonload();
		func();
		}
	}

}


addLoadEvent(initOverlay);