var loadingImage = 'images/popupfogliazza/loading.gif';		


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;

}



function getPageSize(){

	

	var xScroll, yScroll;



	if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac

		xScroll = document.body.scrollWidth;

		yScroll = document.body.scrollHeight;

	} else {

		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;

}



function pause(numberMillis) {

	var now = new Date();

	var exitTime = now.getTime() + numberMillis;

	while (true) {

		now = new Date();

		if (now.getTime() > exitTime)

			return;

	}

}



function showLightbox(objLink)

{



	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[1] + ((arrayPageSize[3] - 35 - objLoadingImage.height) / 2) + 'px');

		objLoadingImage.style.left = (((arrayPageSize[0] - 40 - objLoadingImage.width) / 2) + 'px');

	}



	objOverlay.style.height = (arrayPageSize[1] + 'px');

	objOverlay.style.display = 'block';



	imgPreload = new Image();



	imgPreload.onload=function(){

		objImage.src = objLink.href;



		objLightbox.style.top = (arrayPageScroll[1] + ((arrayPageSize[3] - 35 - imgPreload.height) / 2) + 'px');

		objLightbox.style.left = (((arrayPageSize[0] - 40 - imgPreload.width) / 2) + 'px');



		if (navigator.appVersion.indexOf("MSIE")!=-1){

			pause(250);

		} 



		objLightbox.style.display = 'block';



		return false;

	}



	imgPreload.src = objLink.href;

	

}



function hideLightbox()

{



	objOverlay = document.getElementById('overlay');

	objLightbox = document.getElementById('lightbox');



	objOverlay.style.display = 'none';

	objLightbox.style.display = 'none';

}





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.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.onclick = function () {hideLightbox(); return false;}

	objLightbox.appendChild(objLink);

	

	var objImage = document.createElement("img");

	objImage.setAttribute('id','lightboxImage');

	objLink.appendChild(objImage);

}



function addLoadEvent(func)

{	

	var oldonload = window.onload;

	if (typeof window.onload != 'function'){

    	window.onload = func;

	} else {

		window.onload = function(){

		oldonload();

		func();

		}

	}



}





addLoadEvent(initLightbox);	// run initLightbox onLoad