var loadingImage = 'LargerView/loading4.gif';
var closeButton = 'LargerView/btnClose.gif';
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)
{
        SelectControl=document.getElementsByTagName("SELECT");
        for (x=0;x<SelectControl.length;x++){SelectControl[x].style.visibility="hidden";}
        
        SelectControl=document.getElementsByTagName("OBJECT");
        for (x=0;x<SelectControl.length;x++){SelectControl[x].style.visibility="hidden";}
        
        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 - 38) / 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.style.width = imgPreload.width + 'px';
                        objCaption.innerHTML = objLink.getAttribute('title');
                } else {
                        objCaption.style.display = 'none';
                }
                if (navigator.appVersion.indexOf("MSIE")!=-1){
                        pause(250);
                } 

                if (objLoadingImage) {        objLoadingImage.style.display = 'none'; }
                objLightbox.style.display = 'block';
                arrayPageSize = getPageSize();
                objOverlay.style.height = (arrayPageSize[1] + 'px');
                listenKey();

                return false;
        }
        imgPreload.src = objLink.href;
}

function hideLightbox()
{
        SelectControl=document.getElementsByTagName("SELECT");
        for (x=0;x<SelectControl.length;x++){SelectControl[x].style.visibility="visible";}
        
        SelectControl=document.getElementsByTagName("OBJECT");
        for (x=0;x<SelectControl.length;x++){SelectControl[x].style.visibility="visible";}
        
        objOverlay = document.getElementById('overlay');
        objLightbox = document.getElementById('lightbox');
        objOverlay.style.display = 'none';
        objLightbox.style.display = 'none';
        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','Click to close');
        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);

/*        // create keyboard message
        var objKeyboardMsg = document.createElement("div");
        objKeyboardMsg.setAttribute('id','keyboardMsg');
        objKeyboardMsg.innerHTML = 'press <kbd>x</kbd> to close';
        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);