var loadingImage='./obr/loader.gif';
var closeButton='./func/lightbox/close.png';
function getPageScroll(){
	var yScroll;
	if(self.pageYOffset)yScroll=self.pageYOffset;else if(document.documentElement && document.documentElement.scrollTop){
	  yScroll=document.documentElement.scrollTop;
	} else if(document.body)yScroll=document.body.scrollTop;
	arrayPageScroll=new Array('',yScroll);
	return arrayPageScroll;
}
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;
	arrayPageSize=new Array(pageWidth,pageHeight,windowWidth,windowHeight)
	return arrayPageSize;
}
function pause(numberMillis){
	var now=new Date();
	var exitTime=now.getTime()+numberMillis;
	while (true){now=new Date();if(now.getTime()>exitTime)return;}
}
function getKey(e){
	if(e==null)keycode=event.keyCode;else keycode=e.which;
	key=String.fromCharCode(keycode).toLowerCase();
	if(key=='x')hideLightbox();
}
function listenKey(){document.onkeypress=getKey;}
function showLightbox(objLink)
{
	var objOverlay=document.getElementById('overlay');
	var objLightbox=document.getElementById('lightbox');
	var objCaption=document.getElementById('lightboxCaption');
	var objImage=document.getElementById('lightboxImage');
	var objLoadingImage=document.getElementById('loadingImage');
	var objLightboxDetails=document.getElementById('lightboxDetails');
	var arrayPageSize=getPageSize();
	var arrayPageScroll=getPageScroll();
	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.height=(arrayPageSize[1]+'px');
	objOverlay.style.display='block';
	imgPreload=new Image();
	imgPreload.onload=function(){
		objImage.src=objLink.href;
		var lightboxTop=arrayPageScroll[1]+((arrayPageSize[3]-35-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";
		objLightboxDetails.style.width=imgPreload.width+'px';
		if(objLink.getAttribute('title')){
			objCaption.style.display='block';
			objCaption.innerHTML=objLink.getAttribute('title');
		} else objCaption.style.display='none';
		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;
}
function hideLightbox()
{
	objOverlay=document.getElementById('overlay');
	objLightbox=document.getElementById('lightbox');
	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 initLightbox()
{
	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")=="lightbox")){
			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','lightbox');
	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','Kliknij aby zamkn±æ');
	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);
	var objLightboxDetails=document.createElement("div");
	objLightboxDetails.setAttribute('id','lightboxDetails');
	objLightbox.appendChild(objLightboxDetails);
	var objCaption=document.createElement("div");
	objCaption.setAttribute('id','lightboxCaption');
	objCaption.style.display='none';
	objLightboxDetails.appendChild(objCaption);
	var objKeyboardMsg=document.createElement("div");
	objKeyboardMsg.setAttribute('id','keyboardMsg');
	objKeyboardMsg.innerHTML='<a href="#" onclick="hideLightbox();return false;"></a>';
	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(initLightbox);