var imageLoading = '/loading.gif';
var idSTrans = 'idSemiTransparent';

var thumbnailviewer={
enableTitle: true, //Should "title" attribute of link be used as description?
enableAnimation: true, //Enable fading animation?
definefooter: '<div class="footerbar"><nobr>CLOSE X</nobr></div>',
defineLoading: '<img src="'+imageLoading+'" />',

scrollbarwidth: 16,
opacitystring: 'filter:progid:DXImageTransform.Microsoft.alpha(opacity=10); -moz-opacity: 0.1; opacity: 0.1; background-color: #cccccc;',
targetlinks:[], //Array to hold links with rel="thumbnail"

createthumbBox:function(){
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")
this.thumbImage=document.getElementById("thumbImage") //Reference div that holds the shown image
this.thumbLoading=document.getElementById("thumbLoading") //Reference "loading" div that will be shown while image is fetched
this.standardbody=(document.compatMode=="CSS1Compat")? document.documentElement : document.body //create reference to common "body" across doctypes
},


centerDiv:function(divobj){ //Centers a div element on the page
//<div id='idTest' style="background-color: #cccccc; opacity: 0.5; position: absolute; z-index: 1; left: 0; top: 0; width: 0px; height: 0px;"></div>

if (!document.getElementById(idSTrans)) {
	var oNewDiv = document.createElement('div');
	oNewDiv.setAttribute('id',idSTrans);
	oNewDiv.style.position = 'absolute';
	oNewDiv.style.background = '#cccccc';
	oNewDiv.style.opacity = '0.5';
	oNewDiv.style.left = 0;
	oNewDiv.style.top = 0;
	oNewDiv.style.width = 0;
	oNewDiv.style.height = 0;
	document.body.appendChild(oNewDiv);
}

if (document.getElementById(idSTrans)) {
	document.getElementById(idSTrans).style.width = document.body.clientWidth+'px'
	document.getElementById(idSTrans).style.height = document.body.clientHeight+'px'
	document.getElementById(idSTrans).style.display = 'block'
	if (document.all && document.body.filters) { //IE syntax
		for (i=0;i<document.getElementsByTagName('select').length;i++)
		{
			document.getElementsByTagName('select')[i].style.display = 'none';
		}
		document.getElementById(idSTrans).style.filter= 'alpha(opacity=50)'
	}
}

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
var topposition=(docheight>objheight)? scroll_top+docheight/2-objheight/2+"px" : scroll_top+10+"px" //Vertical position of div element: Either centered, or if element height larger than viewpoint height, 10px from top of viewpoint
divobj.style.left=docwidth/2-objwidth/2+"px" //Center div element horizontally
divobj.style.top=Math.floor(parseInt(topposition))+"px"
divobj.style.visibility="visible"
},

showthumbBox:function(){ //Show ThumbBox 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)
}
},


loadimage:function(link){ //Load image function that gets attached to each link on the page with rel="thumbnail"
if (this.thumbBox.style.visibility=="visible") //if thumbox is visible on the page already
this.closeit() //Hide it first (not doing so causes triggers some positioning bug in Firefox
var imageHTML='<img src="'+link.getAttribute("href")+'" style="'+this.opacitystring+'" />' //Construct HTML for shown image
if (this.enableTitle && link.getAttribute("title")) //Use title attr of the link as description?
imageHTML+='<br />'+link.getAttribute("title")
this.centerDiv(this.thumbLoading) //Center and display "loading" div while we set up the image to be shown
this.thumbImage.innerHTML=imageHTML //Populate thumbImage div with shown image's HTML (while still hidden)
this.featureImage=this.thumbImage.getElementsByTagName("img")[0] //Reference shown image itself
this.featureImage.onload=function(){ //When target image has completely loaded
thumbnailviewer.thumbLoading.style.visibility="hidden" //Hide "loading" div
thumbnailviewer.showthumbBox() //Display "thumbbox" div to the world!
}
if (document.all && !window.createPopup) //Target IE5.0 browsers only. Address IE image cache not firing onload bug: panoramio.com/blog/onload-event/
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
}
},

setimgopacity:function(value){ //Sets the opacity of "thumbimage" div per the passed in value setting (0 to 1 and in between)
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()
},

opacityanimation:function(){ //Gradually increase opacity 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)
},


closeit:function(){ //Close "thumbbox" div function
if (document.getElementById(idSTrans)) {
	document.getElementById(idSTrans).style.width = '0px'
	document.getElementById(idSTrans).style.height = '0px'
	document.getElementById(idSTrans).style.display = 'none'
	if (document.all && document.body.filters) { //IE syntax
		for (i=0;i<document.getElementsByTagName('select').length;i++) {
			document.getElementsByTagName('select')[i].style.display = 'block';
		}
	}
}

this.stopanimation()
this.thumbBox.style.visibility="hidden"
this.thumbImage.innerHTML=""
this.thumbBox.style.left="-2000px"
this.thumbBox.style.top="-2000px"
},

cleanup:function(){ //Clean up routine on page unload
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
},

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

init:function(){ //Initialize thumbnail viewer script by scanning page and attaching appropriate function to links with rel="thumbnail"
if (!this.enableAnimation)
this.opacitystring=""
var pagelinks=document.getElementsByTagName("a")
for (var i=0; i<pagelinks.length; i++){ //BEGIN FOR LOOP
if (pagelinks[i].getAttribute("rel") && pagelinks[i].getAttribute("rel")=="thumbnail"){ //Begin if statement
pagelinks[i].onmouseout = function() {
	window.status = '';
	ShowTitle('',0,0);
	return true;
}
pagelinks[i].onmousemove = function(e) {
	window.status = this.getAttribute('description');
	var curX=(document.getElementById && !document.all)?e.pageX : event.clientX+document.body.scrollLeft;
	var curY=(document.getElementById && !document.all)?e.pageY : event.clientY+document.body.scrollTop;

	ShowTitle(this.getAttribute('description'),curX,curY);
	return true;
}
pagelinks[i].onclick=function(){
thumbnailviewer.stopanimation() //Stop any currently running fade animation on "thumbbox" div before proceeding
thumbnailviewer.loadimage(this) //Load image
return false
}
this.targetlinks[this.targetlinks.length]=pagelinks[i] //store reference to target link
} //end if statement
} //END FOR LOOP
//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

}

thumbnailviewer.createthumbBox() //Output HTML for the image thumbnail viewer
thumbnailviewer.dotask(window, function(){thumbnailviewer.init()}, "load") //Initialize script on page load
thumbnailviewer.dotask(window, function(){thumbnailviewer.cleanup()}, "unload")
function ShowTitle(sTitle,iX,iY)
{
	if (!document.getElementById('divTitle'))
	{
		var oNewDiv = document.createElement('div');
		oNewDiv.setAttribute('id','divTitle');
		oNewDiv.style.position = 'absolute';
		oNewDiv.style.background = '#ffffe0';
		oNewDiv.style.border = '1px solid black';
		oNewDiv.style.padding = '3px';
		oNewDiv.style.opacity = '0.91';
		oNewDiv.style.left = 0;
		oNewDiv.style.top = 0;
		oNewDiv.style.width = '300px';
		document.body.appendChild(oNewDiv);
	}
	if (sTitle)
	{
		document.getElementById('divTitle').style.display = 'block';
		document.getElementById('divTitle').innerHTML = sTitle;
		document.getElementById('divTitle').style.left = iX+"px";
		document.getElementById('divTitle').style.top = (iY+20)+"px"; 
	}
	else
	{
		document.getElementById('divTitle').style.display = 'none';
	}
}