// --------------------------------------------------------------------------------------------
// Image Thumbnail Viewer Script- By Dynamic Drive, available at: http://www.dynamicdrive.com
// Last updated: July 7th, 2008- Fixed enlarged image not showing in IE sometimes
// --------------------------------------------------------------------------------------------
var thumbnailviewer=
{
	enableTitle: true, //Should "title" attribute of link be used as description?
	enableAnimation: true, //Enable fading animation?
	definefooter: '<div class="footerbar">CLOSE X</div>', //Define HTML for footer interface
	defineLoading: '<img src="images/Varie/loading.gif" /> Loading Image...', //Define HTML for "loading" div

	///////////// No need to edit beyond here /////////////////
	scrollbarwidth: 16,
	opacitystring: 'filter:progid:DXImageTransform.Microsoft.alpha(opacity=10); -moz-opacity: 0.1; opacity: 0.1',
	targetlinks:[], //Array to hold links with rel="thumbnail"

	createthumbBox:function()
	{
		//write out HTML for Image Thumbnail Viewer plus loading div
		document.write('<div id="thumbBox" onClick="thumbnailviewer.closeit()"><div id="thumbImage"></div>'+this.definefooter+'</div>')
		document.write('<div id="thumbLoading">'+this.defineLoading+'</div>')
		this.thumbBox=document.getElementById("thumbBox")
		 //Reference div that holds the shown image
		this.thumbImage=document.getElementById("thumbImage")
		 //Reference "loading" div that will be shown while image is fetched
		this.thumbLoading=document.getElementById("thumbLoading")
		 //create reference to common "body" across doctypes
		this.standardbody=(document.compatMode=="CSS1Compat")? document.documentElement : document.body
	},


	//Centers a div element on the page
	centerDiv:function(divobj)
	{
		// creates an array of the html elements on this page. It also cjhecks that the browser is not Opera
		var ie=document.all && !window.opera
		var dom=document.getElementById
		var scroll_top=(ie)? this.standardbody.scrollTop : window.pageYOffset
		var scroll_left=(ie)? this.standardbody.scrollLeft : window.pageXOffset
		var docwidth=(ie)? this.standardbody.clientWidth : window.innerWidth-this.scrollbarwidth
		var docheight=(ie)? this.standardbody.clientHeight: window.innerHeight
		var docheightcomplete=(this.standardbody.offsetHeight>this.standardbody.scrollHeight)? this.standardbody.offsetHeight : this.standardbody.scrollHeight //Full scroll height of document
		var objwidth=divobj.offsetWidth //width of div element
		var objheight=divobj.offsetHeight //height of div element
		//Vertical position of div element: Either centered, or if element height larger than 
		// viewpoint height, 10px from top of viewpoint
		var topposition=(docheight>objheight)? scroll_top+docheight/2-objheight/2+"px" : scroll_top+10+"px"
		divobj.style.left=docwidth/2-objwidth/2+"px" //Center div element horizontally
		divobj.style.top=Math.floor(parseInt(topposition))+"px"
		divobj.style.visibility="visible"
	},

	//Show ThumbBox div
	showthumbBox:function()
	{
		thumbnailviewer.thumbLoading.style.visibility="hidden" //Hide "loading" div
		this.centerDiv(this.thumbBox)
		if (this.enableAnimation)
		{ //If fading animation enabled
			this.currentopacity=0.1 //Starting opacity value
			this.opacitytimer=setInterval("thumbnailviewer.opacityanimation()", 20)
		}
	},


	//Load image function that gets attached to each link on the page with rel="thumbnail"
	loadimage:function(link)
	{
		if (this.thumbBox.style.visibility=="visible") //if thumbBox is visible on the page already
			this.closeit() //Hide it first (not doing so triggers some positioning bug in Firefox

 		//Construct HTML for shown image
 		var imageHTML='<img src="'+link.getAttribute("href")+'" style="'+this.opacitystring+'" />'

		if (this.enableTitle && link.getAttribute("title")) //Use title attr of the link as description?
			imageHTML+='<br />'+link.getAttribute("title")

		//Center and display "loading" div while we set up the image to be shown
		this.centerDiv(this.thumbLoading)
		//Populate thumbImage div with shown image's HTML (while still hidden)
		this.thumbImage.innerHTML=imageHTML
		this.featureImage=this.thumbImage.getElementsByTagName("img")[0] //Reference shown image itself
		if (this.featureImage.complete)
			thumbnailviewer.showthumbBox()
		else
		{
			//When target image has completely loaded
			this.featureImage.onload=function()
			{
				thumbnailviewer.showthumbBox() //Display "thumbbox" div to the world!
			}
		}
		//Target IE5.0 browsers only. Address IE image cache not firing onload bug: panoramio.com/blog/onload-event/
		if (document.all && !window.createPopup)
		this.featureImage.src=link.getAttribute("href")
		this.featureImage.onerror=function()
		{	//If an error has occurred while loading the image to show
			thumbnailviewer.thumbLoading.style.visibility="hidden" //Hide "loading" div, game over
		}
	},

	//Sets the opacity of "thumbimage" div per the passed in value setting (0 to 1 and in between)
 	setimgopacity:function(value)
	{
		var targetobject=this.featureImage
		if (targetobject.filters && targetobject.filters[0])
		{ //IE syntax
			if (typeof targetobject.filters[0].opacity=="number") //IE6
				targetobject.filters[0].opacity=value*100
			else //IE 5.5
				targetobject.style.filter="alpha(opacity="+value*100+")"
		}
		else if (typeof targetobject.style.MozOpacity!="undefined") //Old Mozilla syntax
			targetobject.style.MozOpacity=value
		else if (typeof targetobject.style.opacity!="undefined") //Standard opacity syntax
			targetobject.style.opacity=value
		else //Non of the above, stop opacity animation
			this.stopanimation()
	},

	//Gradually increase opacity function
 	opacityanimation:function()
	{
		this.setimgopacity(this.currentopacity)
		this.currentopacity += 0.1
		if (this.currentopacity>1)
			this.stopanimation()
	},

	stopanimation:function()
	{
		if (typeof this.opacitytimer!="undefined")
			clearInterval(this.opacitytimer)
	},

	//Close "thumbbox" div function
	closeit:function()
	{
		this.stopanimation()
		this.thumbBox.style.visibility="hidden"
		this.thumbImage.innerHTML=""
		this.thumbBox.style.left="-2000px"
		this.thumbBox.style.top="-2000px"
	},

	//Clean up routine on page unload
	cleanup:function()
	{
		this.thumbLoading=null
		if (this.featureImage) this.featureImage.onload=null
			this.featureImage=null
		this.thumbImage=null
		for (var i=0; i<this.targetlinks.length; i++)
			this.targetlinks[i].onclick=null
		this.thumbBox=null
	},

	//assign a function to execute to an event handler (ie: onunload)
	dotask:function(target, functionref, tasktype)
	{
		var tasktype=(window.addEventListener)? tasktype : "on"+tasktype

		if (target.addEventListener)
			target.addEventListener(tasktype, functionref, false)
		else if (target.attachEvent)
			target.attachEvent(tasktype, functionref)
	},

	//==================================================================================
	//Initialize thumbnail viewer script by scanning page and attaching appropriate 
	//function to links with rel="thumbnail"
	init:function()
	{
		if (!this.enableAnimation)
			this.opacitystring=""

		// returns an array of all elements contained by the current object (document.) whose tags 
		// match the tag name supplied as the parameter to the method ("a")
		var pagelinks=document.getElementsByTagName("a")
		for (var i=0; i<pagelinks.length; i++)
		{
			// checks if the element has the "rel" attribute defined and if that attribute equals "thumbnail"
			if (pagelinks[i].getAttribute("rel") && pagelinks[i].getAttribute("rel")=="thumbnail")
			{ 	//Associates to the element the onclick function to stop existing amimation and load the pointed image
				pagelinks[i].onclick=function()
				{
					//Stop any currently running fade animation on "thumbbox" div before proceeding
					thumbnailviewer.stopanimation()
					thumbnailviewer.loadimage(this) //Load image
					return false
				}
				//store reference to target link of this element
				this.targetlinks[this.targetlinks.length]=pagelinks[i]
			}
		}

		//Reposition "thumbbox" div when page is resized
		this.dotask(window, 
			function()
			{
				if (thumbnailviewer.thumbBox.style.visibility=="visible") thumbnailviewer.centerDiv(thumbnailviewer.thumbBox)
			}, "resize")
	} //END init() function
}

//Output HTML for the image thumbnail viewer
thumbnailviewer.createthumbBox()
//Initialize script on page load
thumbnailviewer.dotask(window, function(){thumbnailviewer.init()}, "load")
thumbnailviewer.dotask(window, function(){thumbnailviewer.cleanup()}, "unload")

// Enf Of Thumbnail Viewer