/* JAVASCRIPT DOCUMENT FOR VIEWING FULLSIZE IMAGE OVERLAYS */

// If you would like to use a custom loading image or close button reference them in the next two lines.
var loadingImage = '';
var viewerBoxCloseButton = 'http://mcw3.cshosting.nl/_images/btn_close.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 (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;
}

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

//listenKey()
function listenKey () {	document.onkeypress = getKey; }
	
function showViewerBox(objLink) {
	// prep objects
	var objOverlay = document.getElementById('viewerBoxOverlay');
	var objBox = document.getElementById('viewerBox');
	var objCaption = document.getElementById('viewerBoxCaption');
	var objImage = document.getElementById('viewerBoxImage');
	var objContent = document.getElementById('viewerBoxContent');	
	var objLoadingImage = document.getElementById('viewerBoxLoadingImage');
	var objCloseButton = document.getElementById('viewerBoxCloseButton');
	var objDetails = document.getElementById('viewerBoxDetails');
	var objCloseMsg = document.getElementById('viewerBoxCloseMsg');
	
	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();	
	
	// center loadingImage if it exists
	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';
	}

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

	if (objLink.href.indexOf("divVideo") == -1) {
		// preload image
		imgPreload = new Image();
	
		imgPreload.onload = function() {
			objImage.src = objLink.href;
	
			// center viewer and make sure that the top and left values are not negative
			// and the image placed outside the viewport
			var viewerTop = arrayPageScroll[1] + ((arrayPageSize[3] - 35 - imgPreload.height) / 2);
			var viewerLeft = ((arrayPageSize[0] - 20 - imgPreload.width) / 2);
			
			objBox.style.top = (viewerTop < 0) ? "0px" : viewerTop + "px";
			objBox.style.left = (viewerLeft < 0) ? "0px" : viewerLeft + "px";
			
			objDetails.style.width = imgPreload.width + 'px';
			
			if(objLink.getAttribute('title')){
				objCaption.style.display = 'block';
				//objCaption.style.width = imgPreload.width + 'px';
				objCaption.innerHTML = objLink.getAttribute('title');
			} else {
				objCaption.style.display = 'none';
			}
			
			// 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);
			} 
	
			if (objLoadingImage) { objLoadingImage.style.display = 'none'; }
	
			// 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";
			}
			
			objImage.style.display = "block";
			if (objCloseButton)
				objCloseButton.style.display = "block"; 
			objCloseMsg.innerHTML = "<a href='#' onclick='hideViewerBox(); return false;'>afbeelding sluiten</a>";
			objBox.style.display = "block";
		}
		imgPreload.src = objLink.href;	
	} else {
		var strDivId = objLink.href.substr(objLink.href.indexOf("divVideo"), objLink.href.length);
		document.getElementById(strDivId).style.display = "block";
		objContent.appendChild(document.getElementById(strDivId));
		objContent.style.display = "block";
		
		var intHeight = document.getElementById(strDivId).style.height;
		intHeight = intHeight.substr(0, intHeight.indexOf("px"));
		var intWidth = document.getElementById(strDivId).style.width;
		intWidth = intWidth.substr(0, intWidth.indexOf("px"));
		
		var viewerTop = arrayPageScroll[1] + ((arrayPageSize[3] - 35 - intHeight) / 2);
		var viewerLeft = ((arrayPageSize[0] - 20 - intWidth) / 2);
		
		objBox.style.top = (viewerTop < 0) ? "0px" : viewerTop + "px";
		objBox.style.left = (viewerLeft < 0) ? "0px" : viewerLeft + "px";

		objDetails.style.width = intWidth + 'px';
		
		if(objLink.getAttribute('title')){
			objCaption.style.display = 'block';
			objCaption.innerHTML = objLink.getAttribute('title');
		} else {
			objCaption.style.display = 'none';
		}
		
		// 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";
		}
		objImage.style.display = "none";
		objCloseButton.style.display = "none"; 
		objCloseMsg.innerHTML = "<a href='#' onclick='hideViewerBox(\"" + strDivId + "\"); return false;'>video sluiten</a>";
		objBox.style.display = "block";
	}
	
	arrayPageSize = getPageSize();
	objOverlay.style.height = (arrayPageSize[1] + 'px');
	
	// Check for 'x' keypress
	listenKey();

	return false;
}

function hideViewerBox(strDivId) {
	// get objects
	var objOverlay = document.getElementById('viewerBoxOverlay');
	var objBox = document.getElementById('viewerBox');
	var objContentContainer = document.getElementById('viewerBoxContent');
	

	// hide viewerBox and viewerBoxOverlay
	objOverlay.style.display = 'none';
	objBox.style.display = 'none';
	objContentContainer.style.display = 'none';
	if (document.getElementById(strDivId)) document.getElementById(strDivId).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 = '';
}

function initViewerBox() {
	if (!document.getElementsByTagName){ return; }
	
    var divNodes = document.getElementsByTagName("div");  
 
    // loop through all anchor tags
	for (var i=0; i < divNodes.length; i++) {
		var node = divNodes[i];		
		var nodeAttr = node.getAttributeNode("class");
        
		if (nodeAttr && nodeAttr.value != "" && nodeAttr.value == "mainRightColumnBoxVariant1"){
			var thumbBox = node;
		}	
	}
	
	if (thumbBox) {	
	    var headerTxt;
	    var thumbSrc = new Array();
        var thumbAlt = new Array();
        var photoSrc = new Array();	
	    var thumbNodes = thumbBox.getElementsByTagName("img");
        
        // push img node attributes into the arrays
        for (var i=0; i < thumbNodes.length; i++) {
		    var node = thumbNodes[i];
            var nodeSrsAttr = node.getAttributeNode("src");
            var nodeAltAttr = node.getAttributeNode("alt");
           
            if (node.parentNode.tagName == "A") {
                var nodeHrefAttr = node.parentNode.getAttributeNode("href");
                photoSrc.push(nodeHrefAttr.value);
            }else {
                photoSrc.push("empty");
            }              
            
            thumbSrc.push(nodeSrsAttr.value);
            thumbAlt.push(nodeAltAttr.value);
	    }
    		   	    
	    var headerNode = thumbBox.getElementsByTagName("h3");
	    
	    if (objBrowserDetect && objBrowserDetect.Browser == "Explorer")
	        headerTxt = headerNode[0].innerText;
	    else
	        headerTxt = headerNode[0].textContent;
	        
    	/* Remove the old HTML*/
    	thumbBox.innerHTML = "";
    	
    	/* Firefox needs class, IE needs className */    		
    	var objH3 = document.createElement("H3");    	
	    objH3.setAttribute('className','rightColumnBoxPhoto');
	    objH3.setAttribute('class','rightColumnBoxPhoto');
	    if (objBrowserDetect && objBrowserDetect.Browser == "Explorer") {
	        if (headerTxt != "")
    	        objH3.innerText = headerTxt;
    	}
    	else {
    	    if (headerTxt != "")
    	        objH3.textContent = headerTxt;	
    	}    
	    
	    thumbBox.appendChild(objH3, thumbBox.firstChild);
	    
	    var objUL = document.createElement("ul");
    	objUL.setAttribute('className','imageContainer');
    	objUL.setAttribute('class','imageContainer');	    	
    	
        for (var i=0; i < thumbSrc.length; i++) {
            var objLI = document.createElement('li');
         
            var objA = document.createElement('a');
            objA.setAttribute('href', photoSrc[i]);
            objA.setAttribute('rel', 'viewerBox');
            objA.setAttribute('title', thumbAlt[i]);         
            
            var objImgNormal = document.createElement('img');
            objImgNormal.setAttribute('src', thumbSrc[i]);
            objImgNormal.setAttribute('alt', thumbAlt[i]);
            objImgNormal.setAttribute('width','89');
            objImgNormal.setAttribute('height', '62');
            objImgNormal.setAttribute('className', 'imgVariant3');
            objImgNormal.setAttribute('class', 'imgVariant3');  
            
            var objImgOver = document.createElement('img');
            objImgOver.setAttribute('src', thumbSrc[i]);
            objImgOver.setAttribute('alt', thumbAlt[i]);
            objImgOver.setAttribute('className', 'imgOverVariant3');
            objImgOver.setAttribute('class', 'imgOverVariant3');           
            
            /* Append nodes */
            /* the string 'empty' is added in the code above  */
            if (photoSrc[i] != "empty"){
                objA.appendChild(objImgNormal, objA.lastChild);
                objA.appendChild(objImgOver, objA.lastChild);
                objLI.appendChild(objA, objLI.lastChild);            
                objUL.appendChild(objLI, objUL.lastChild);
            } else {
                objLI.appendChild(objImgNormal, objLI.lastChild);            
                objUL.appendChild(objLI, objUL.lastChild);
           }
        }
        
        /* Append nodes to the div */
        thumbBox.appendChild(objUL, thumbBox.lastChild);
    }
	
	var anchors = document.getElementsByTagName("a");

	// loop through all anchor tags
	for (var i=0; i < anchors.length; i++) {
		var anchor = anchors[i];

		if (anchor.getAttribute("href") && (anchor.getAttribute("rel") == "viewerBox")){
			anchor.onclick = function () {showViewerBox(this); return false;}
		}
	}
	
	var objBody = document.getElementsByTagName("body").item(0);
	
	// create viewerBoxOverlay div and hardcode some functional styles (aesthetic styles are in CSS file)
	var objOverlay = document.createElement("div");
	objOverlay.setAttribute('id','viewerBoxOverlay');
	objOverlay.onclick = function () {hideViewerBox(); 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();

	// preload and create loader image
	var imgPreloader = new Image();
	
	// if loader image found, create link to hide viewerBox and create loadingimage
	imgPreloader.onload = function() {
		var objLoadingImageLink = document.createElement("a");
		objLoadingImageLink.setAttribute('href','#');
		objLoadingImageLink.onclick = function () {hideViewerBox(); return false;}
		objOverlay.appendChild(objLoadingImageLink);
		
		var objLoadingImage = document.createElement("img");
		objLoadingImage.src = loadingImage;
		objLoadingImage.setAttribute('id','viewerBoxLoadingImage');
		objLoadingImage.style.position = 'absolute';
		objLoadingImage.style.zIndex = '150';
		objLoadingImageLink.appendChild(objLoadingImage);

		imgPreloader.onload = function() {};	//	clear onLoad, as IE will flip out w/animated gifs

		return false;
	}

	imgPreloader.src = loadingImage;

	// create viewerBox div, same note about styles as above
	var objBox = document.createElement("div");
	objBox.setAttribute('id','viewerBox');
	objBox.style.display = 'none';
	objBox.style.position = 'absolute';
	objBox.style.zIndex = '100';	
	objBody.insertBefore(objBox, objOverlay.nextSibling);
	
	// create link
	var objLink = document.createElement("a");
	objLink.setAttribute('href','#');
	objLink.setAttribute('title','Klik om de afbeelding te sluiten');
	objLink.onclick = function () {hideViewerBox(); return false;}
	objBox.appendChild(objLink);

	// preload and create close button image
	var imgPreloadCloseButton = new Image();

	// if close button image found, 
	imgPreloadCloseButton.onload = function() {
		var objCloseButton = document.createElement("img");
		objCloseButton.src = viewerBoxCloseButton;
		objCloseButton.setAttribute('id','viewerBoxCloseButton');
		objCloseButton.style.position = 'absolute';
		objCloseButton.style.zIndex = '200';
		objLink.appendChild(objCloseButton);

		return false;
	}
	imgPreloadCloseButton.src = viewerBoxCloseButton;

	// create image
	var objImage = document.createElement("img");
	objImage.setAttribute('id','viewerBoxImage');
	objLink.appendChild(objImage);
	
	//create div
	var objContent = document.createElement("div");
	objContent.setAttribute('id','viewerBoxContent');
	//objContent.setAttribute('style','style.display = none;');
	objBox.appendChild(objContent);
	
	// create details div, a container for the caption and keyboard message
	var objDetails = document.createElement("div");
	objDetails.setAttribute('id','viewerBoxDetails');
	objBox.appendChild(objDetails);

	// create caption
	var objCaption = document.createElement("div");
	objCaption.setAttribute('id','viewerBoxCaption');
	objCaption.style.display = 'none';
	objDetails.appendChild(objCaption);

	// create keyboard message
	var objCloseMsg = document.createElement("div");
	objCloseMsg.setAttribute('id','viewerBoxCloseMsg');
	objDetails.appendChild(objCloseMsg);
}

addLoadEvent(initViewerBox); // run initViewerBox onLoad