// -------------------------------------------------------------------
// 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" onClick="thumbnailviewer.closeit()"><img src="img/close.gif" alt="CLOSE" style="border: 0px solid black;" /></div>', //Define HTML for footer interface
	defineLoading: '<img src="img/loading.gif" /> Loading Image...', //Define HTML for "loading" div
	thumbNahid: 0,
	/////////////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"
	thumbImg:[],

	setImgArray:function(){
	},

	createthumbBox:function(){
		//write out HTML for Image Thumbnail Viewer plus loading div
		document.write('<div id="thumbBox"><div id="thumbImage"></div></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")
		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
		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+0+"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
		var ss = docwidth/2-objwidth/2
//		alert('docwidth: '+docwidth+';objwidth: '+objwidth+';left: '+ss)
		divobj.style.top=Math.floor(parseInt(topposition))+"px"
		divobj.style.visibility="visible"
	},

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


	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='<table>' //Construct HTML for shown image
/*		
		imageHTML+='<tr>'
		imageHTML+='<td style="text-align: center;">'
		imageHTML+='</td>'
		imageHTML+='</tr>'
*/
		imageHTML+='<tr>'
		imageHTML+='<td style="width: 650px;text-align: center;">'
			imageHTML+='<img src="'+link.getAttribute("href")+'" style="'+this.opacitystring+'" id="innerOpacityImage" />'
		imageHTML+='</td>'
		imageHTML+='<td style="vertical-align: top;text-align: center; width: 300px;">'
			imageHTML+=''+this.definefooter+'<br /><br /><br />'

		if (this.enableTitle && link.getAttribute("title")) //Use title attr of the link as description?
			imageHTML+='<div style="font-size: 14px;line-height: 18px;font-weight: bold; color: #7F7F7F;border: 0px solid black;">'+link.getAttribute("title")+'</div><br /><br />'



		for (var i=0; i<this.thumbImg.length; i++){
			if(i % 2 == 1) imageHTML+='&nbsp;&nbsp;&nbsp;&nbsp;'
			imageHTML+='<img src="'+this.thumbImg[i][1]+'" style="width: 70px; height: 70px" class="nahledy"'
			imageHTML+=' onclick="	document.images[\'innerOpacityImage\'].style.filter=\'\';document.images[\'innerOpacityImage\'].style.filter=\'\';document.images[\'innerOpacityImage\'].style.opacity=\'1\';document.images[\'innerOpacityImage\'].src=\''+this.thumbImg[i][0]+'\';thumbnailviewer.oznacthumb(this)"'
			imageHTML+=' id="thumbname'+i+'"';
			imageHTML+=' />'
/*
			imageHTML+='<a href="'+this.thumbImg[i][0]+'" title="'+this.thumbImg[i][2]+'" onclick="thumbnailviewer.stopanimation();thumbnailviewer.loadimage(this);return false;"><img src="'+this.thumbImg[i][1]+'" style="width: 70px; height: 70px" '
			imageHTML+=''
			imageHTML+=' /></a>'
*/
			if(i % 2 == 1)imageHTML+='<br />'
//				this.thumbImg[i].onclick=null
		}
		imageHTML+='</td>'
		imageHTML+='</tr>'
		imageHTML+='<table>'


		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=document.getElementById("innerOpacityImage") //Reference shown image itself
		if (this.featureImage.complete)
			thumbnailviewer.showthumbBox()
		else{
			this.featureImage.onload=function(){ //When target image has completely loaded
				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
		}
	},

	oznacthumb:function(thumbNah){
		if(this.thumbNahid!=0){
			this.thumbNahid.style.border='1px solid #C1C1C1'
			this.thumbNahid.style.margin='1px'
//			alert()
		}
		thumbNah.style.border='2px solid red'
		thumbNah.style.margin='0px'
		this.thumbNahid=thumbNah
//		alert(this.thumbNahid)
		this.enableKeyboardNav()
	},

	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
		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.disableKeyboardNav()
		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)
	},

	setthumbImg:function(nahledy){
		this.thumbImg=nahledy
	},

    //
    enableKeyboardNav: function() {
        document.observe('keydown', this.keyboardAction); 
    },

	disableKeyboardNav: function() {
        document.stopObserving('keydown', this.keyboardAction); 
    },

	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].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
/*
		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")=="fama"){ //Begin if statement
				this.thumbImg[this.thumbImg.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")

/*
  <script type="text/javascript">
document.onkeyup = checkKeycode
function checkKeycode(e) {
	var keycode;
	if (window.event) keycode = window.event.keyCode;
	else if (e) keycode = e.which;
	if(keycode == 27){
		alert('stisknul jsi t');
	}
	alert('keycode: '+keycode);
}
</script>
<div>
<p>pokus odchytávání klávesy</p>
<input type="text">
</div>

*/