/*
	Lightbox JS: Fullsize Image Overlays 
	by Lokesh Dhakar - http://www.huddletogether.com

	For more information on this script, visit:
	http://huddletogether.com/projects/lightbox/

	Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
	(basically, do anything you want, just leave my name and link)
	
	Table of Contents
	-----------------
	Configuration
	
	Functions
	- getPageScroll()
	- getPageSize()
	- pause()
	- getKey()
	- listenKey()
	- showLightbox()
	- hideLightbox()
	- initLightbox()
	- addLoadEvent()
	
	Function Calls
	- addLoadEvent(initLightbox)

*/



//
// Configuration
//

// If you would like to use a custom loading image or close button reference them in the next two lines.
var loadingImage = '';		
var closeButton = '';		

isIE=false;
_IEVersion=false;


//
// 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;
	}
}

//
// showLightbox()
// Preloads images. Pleaces new image in lightbox then centers and displays.
//
function showAlertbox()
{
	
	var objOverlay = $('_overlay');
	
	
	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';
	
	
	var inner_flash = $('inner_flash');
	var inner_flash_width = inner_flash.offsetWidth  > 0 ? inner_flash.offsetWidth : 592; 
	var inner_flash_height = inner_flash.offsetHeight  > 0 ? inner_flash.offsetHeight : 80; 
	
	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();

	var lightboxTop = arrayPageScroll[1] + ((arrayPageSize[3] - 35 - inner_flash_height) / 2);
	var lightboxLeft = ((arrayPageSize[0] - 20 - inner_flash_width) / 2);
		
	inner_flash.style.top = (lightboxTop < 0) ? "0px" : lightboxTop + "px";
	inner_flash.style.left = (lightboxLeft < 0) ? "0px" : lightboxLeft + "px";
	
	
	if(isIE && _IEVersion==6){
	
		var selects = $$("select");
		selects.each(function(n) { 
		
		var curleft = 0 ;
		var curtop = 0;
		var q=n;
		
		if (q.offsetParent) {

		do{
			curleft += q.offsetLeft ? q.offsetLeft: 0  ;
			curtop += q.offsetTop ? q.offsetTop : 0 ;
		} while (q = q.offsetParent);	
				
		}

		if(curtop+n.offsetHeight>lightboxTop && curtop < lightboxTop + inner_flash_height && curleft+n.offsetWidth > lightboxLeft && curleft < lightboxLeft + inner_flash_width  ){		
		n.style.visibility = "hidden"; 
		}
		
		});	
		
		
		
	}

	// 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);
		} 
		
	Effect.Appear('inner_flash', { duration: 1 });

	// After image is loaded, update the overlay height as the new image might have
	// increased the overall page height.
	arrayPageSize = getPageSize();

	
return false;
	
}





//
// hideLightbox()
//
function hideAlertbox()
{
	var inner_flash = $('inner_flash');
	
	$('_overlay').hide();
	
	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();

	var lightboxTop = arrayPageScroll[1] + ((arrayPageSize[3] - 35 - inner_flash.offsetHeight) / 2);
	var lightboxLeft = ((arrayPageSize[0] - 20 - inner_flash.offsetWidth) / 2);
	
	if(isIE && _IEVersion==6){
	
		var selects = $$("select");
		selects.each(function(n) { 
	
		n.style.visibility = "visible"; 
	
		
		});	
		
		
		
	}

	Effect.Fade('inner_flash',{ duration: 0.5 });		

}




//
// initLightbox()
// Function runs on window load, going through link tags looking for rel="lightbox".
// These links receive onclick events that enable the lightbox 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 initLightbox()
{
	
	isIE = (navigator.appName=="Microsoft Internet Explorer");
	_IEVersion = navigator.appVersion;
	if(isIE) {
	_IEVersion = parseInt(_IEVersion.substr(_IEVersion.indexOf("MSIE")+4));
		} else {
	_IEVersion = 0;
	}
	
	var objBody = document.getElementsByTagName("body").item(0);
	//objBody = $(objBody);
	
	var objOverlay = document.createElement("div");
	objOverlay.setAttribute('id','_overlay');
	objOverlay.onclick = function () { hideAlertbox(); 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 objLightbox = new Element('div',{id:'inner_flash',style: 'display:none'});
	objLightbox.style.zIndex = '110';
	/*objLightbox.onmouseover = function(){clearTimeout(flashesTimer)}
	objLightbox.onmouseout = function(){flashesTimer=setTimeout('flash_error(\'\')',2000)}*/
	//objBody.insert(objLightbox, 'bottom'); 
	objBody.insertBefore(objLightbox, objOverlay.nextSibling);

}




//
// 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(initLightbox);	// run initLightbox onLoad