/*
	popupLayer JS from lightbox
	Call from html
	<div><a id="bannerLayer" href="popup/somebanner.jpg" rel="any.html or http://any.com"></a></div>
*/

//
// Configuration
//

//
// 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;
	}
}

//
// getKey(key)
// Gets keycode. If 'x' is pressed then it hides the popupLayer.
//

function getKey(e){
	if (e == null) { // ie
		keycode = event.keyCode;
	} else { // mozilla
		keycode = e.which;
	}
	key = String.fromCharCode(keycode).toLowerCase();
	
	if(key == 'x'){ hidepopupLayer(); }
}


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

//
// showpopupLayer()
// Preloads images. Pleaces new image in popupLayer then centers and displays.
//
function showpopupLayer(objpopupLayerLink)
{
	// prep objects
	var objOverlay = document.getElementById('popupOverlay');
	var objpopupLayer = document.getElementById('popupLayer');
	var objImage = document.getElementById('popupLayerImage');
	

	
	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';

	// preload image
	imgPreload = new Image();

	imgPreload.onload=function(){
		objImage.src = objpopupLayerLink.href;

		// center popupLayer and make sure that the top and left values are not negative
		// and the image placed outside the viewport
		var popupLayerTop = arrayPageScroll[1] + ((arrayPageSize[3] - 35 - imgPreload.height) / 2);
		var popupLayerLeft = ((arrayPageSize[0] - 20 - imgPreload.width) / 2);
		
		objpopupLayer.style.top = (popupLayerTop < 0) ? "0px" : popupLayerTop + "px";
		objpopupLayer.style.left = (popupLayerLeft < 0) ? "0px" : popupLayerLeft + "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 the image in IE
		selects = document.getElementsByTagName("select");
		for (i = 0; i != selects.length; i++) {
			selects[i].style.visibility = "hidden";
		}

	
		objpopupLayer.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;
	}

	imgPreload.src = objpopupLayerLink.href;
	
}





//
// hidepopupLayer()
//
function hidepopupLayer()
{
	// get objects
	objOverlay = document.getElementById('popupOverlay');
	objpopupLayer = document.getElementById('popupLayer');

	// hide popupLayer and overlay
	objOverlay.style.display = 'none';
	objpopupLayer.style.display = 'none';

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

	// disable keypress listener
	document.onkeypress = '';
}




//
// initpopupLayer()
// Function runs on window load, going through link tags looking for rel="popupLayer".
// These links receive onclick events that enable the popupLayer 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 initpopupLayer()
{
	
	if(!document.getElementById("bannerLayer"))return;
	var anchor = document.getElementById("bannerLayer");


	// my
	//
	// <div id="overlay"></div>
	// <div id="popupLayer">
	//		<a><img id="popupLayerImage" /></a>
	//		<div><a>Bezár</a></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','popupOverlay');
	objOverlay.onclick = function () {hidepopupLayer(); 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%';
	objOverlay.style.background = '#666';
	objOverlay.style.opacity = '0.4';
	objOverlay.style.filter = 'alpha(opacity=40)';
	objBody.insertBefore(objOverlay, objBody.firstChild);
	
	
	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();

	// create popupLayer div, same note about styles as above
	var objpopupLayer = document.createElement("div");
	objpopupLayer.setAttribute('id','popupLayer');
	objpopupLayer.style.display = 'none';
	objpopupLayer.style.position = 'absolute';
	objpopupLayer.style.zIndex = '100';
	objpopupLayer.style.border = '1px solid #ddd';
	objBody.insertBefore(objpopupLayer, objOverlay.nextSibling);
	
	// create link
	var objpopupLayerLink = document.createElement("a");
	objpopupLayerLink.setAttribute('href','#');
	
	if(anchor.rel)
	{
		objpopupLayerLink.setAttribute('title','Tovább');
		objpopupLayerLink.onclick = function () {document.location.href=anchor.rel; return false;}
	} else {
		objpopupLayerLink.setAttribute('title','Bezár');	
		objpopupLayerLink.onclick = function () {hidepopupLayer(); return false;}
	}
	objpopupLayer.appendChild(objpopupLayerLink);


	var objCloseButton = document.createElement("div");
	objCloseButton.style.position = 'absolute';
	objCloseButton.style.zIndex = '200';
	objCloseButton.style.background = '#efefef';
	objCloseButton.style.width = '40px';
	objCloseButton.style.height = '16px';
	objCloseButton.style.lineHeight = '16px';
	objCloseButton.style.top = '-18px';
	objCloseButton.style.right = '1px';
	objCloseButton.style.textAlign = 'center';
	objCloseButton.style.borderBottom = '1px solid #dcdcdc';
	objpopupLayer.appendChild(objCloseButton);
	
	var CloseLink = objCloseButton.appendChild(document.createElement('a'));
	CloseLink.href = '#ng';
	CloseLink.innerHTML = 'Bezár';
	CloseLink.onclick = hidepopupLayer;
	CloseLink.style.font = "normal 10px arial";
	CloseLink.style.textDecoration = "none";
	CloseLink.style.color = "#888";


	// create image
	var objImage = document.createElement("img");
	objImage.setAttribute('id','popupLayerImage');
	objImage.style.border = 'solid 4px #fff';
	objImage.style.display = 'block';
	objpopupLayerLink.appendChild(objImage);
	
	//mutassad!
	showpopupLayer(anchor);
}




//
// 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(initpopupLayer);