var thumbnailviewer={
	enableTitle: true,
	enableAnimation: true,
	definefooter: '<div class="lablec">Bezárás</div>',
	defineLoading: '<img src="../kepek/loading.gif" /> A kép betöltése folyamatban...',

	scrollbarwidth: 16,
	opacitystring: 'filter:progid:DXImageTransform.Microsoft.alpha(opacity=10); -moz-opacity: 0.1; opacity: 0.1',
	targetlinks:[],

	createthumbBox:function(){
		document.write('<div id="kepnezo_ablak" onClick="thumbnailviewer.closeit()"><div id="kep"></div>'+this.definefooter+'</div>')
		document.write('<div id="varjon">'+this.defineLoading+'</div>')
		this.thumbBox=document.getElementById("kepnezo_ablak")
		this.thumbImage=document.getElementById("kep")
		this.thumbLoading=document.getElementById("varjon")
		this.standardbody=(document.compatMode=="CSS1Compat")? document.documentElement : document.body
	},

	centerDiv:function(divobj){
		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
		var objwidth=divobj.offsetWidth
		var objheight=divobj.offsetHeight
		var topposition=(docheight>objheight)? scroll_top+docheight/2-objheight/2+"px" : scroll_top+10+"px"
		divobj.style.left=docwidth/2-objwidth/2+"px"
		divobj.style.top=Math.floor(parseInt(topposition))+"px"
		divobj.style.visibility="visible"
	},

	showthumbBox:function(){
		this.centerDiv(this.thumbBox)
		if (this.enableAnimation){
			this.currentopacity=0.1
			this.opacitytimer=setInterval("thumbnailviewer.opacityanimation()", 20)
	}
},

loadimage:function(link){
	if (this.thumbBox.style.visibility=="visible")
	this.closeit()
	var imageHTML='<img src="'+link.getAttribute("href")+'" style="'+this.opacitystring+'" />'
	if (this.enableTitle && link.getAttribute("title"))
	imageHTML+='<br />'+link.getAttribute("title")
	this.centerDiv(this.thumbLoading)
	this.thumbImage.innerHTML=imageHTML
	this.featureImage=this.thumbImage.getElementsByTagName("img")[0]
	this.featureImage.onload=function(){
		thumbnailviewer.thumbLoading.style.visibility="hidden"
		thumbnailviewer.showthumbBox()
	}

if (document.all && !window.createPopup)
	this.featureImage.src=link.getAttribute("href")
	this.featureImage.onerror=function(){
		thumbnailviewer.thumbLoading.style.visibility="hidden"
	}
},

setimgopacity:function(value){
	var targetobject=this.featureImage
	if (targetobject.filters && targetobject.filters[0]){
		if (typeof targetobject.filters[0].opacity=="number")
			targetobject.filters[0].opacity=value*100
		else
			targetobject.style.filter="alpha(opacity="+value*100+")"
		}
		else if (typeof targetobject.style.MozOpacity!="undefined")
			targetobject.style.MozOpacity=value
		else if (typeof targetobject.style.opacity!="undefined")
			targetobject.style.opacity=value
		else
			this.stopanimation()
},

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)
},

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

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
},

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)
},

init:function(){
	if (!this.enableAnimation)
	this.opacitystring=""
	var pagelinks=document.getElementsByTagName("a")
	for (var i=0; i<pagelinks.length; i++){
		if (pagelinks[i].getAttribute("rel") && pagelinks[i].getAttribute("rel")=="thumbnail"){
			pagelinks[i].onclick=function(){
				thumbnailviewer.stopanimation()
				thumbnailviewer.loadimage(this)
				return false
			}
			this.targetlinks[this.targetlinks.length]=pagelinks[i]
		}
	}

	this.dotask(window, function(){
		if (thumbnailviewer.thumbBox.style.visibility=="visible") thumbnailviewer.centerDiv(thumbnailviewer.thumbBox)}, "resize")
	}
}

thumbnailviewer.createthumbBox()
thumbnailviewer.dotask(window, function(){thumbnailviewer.init()}, "load")
thumbnailviewer.dotask(window, function(){thumbnailviewer.cleanup()}, "unload")