// -------------------------------------------------------------------
// 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">Bild schliessen X</div>', //Define HTML for footer interface
defineLoading: '<img src="fileadmin/templates/externeScripts/Grabgestaltung/scripts/loading.gif" /> Bild wird geladen ...', //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 style="float:left" id="thumbImage"></div><div style="float:right" id="thumbDescr"></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.thumbDescr=document.getElementById("thumbDescr");
	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+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
	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);
	}
},

//changed wd, to get description on the right side

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
	descrHTML ="";
	if (this.enableTitle && link.getAttribute("title")){//Use title attr of the link as description?
		descrHTML = 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)
	if (descrHTML != ""){this.thumbDescr.innerHTML=descrHTML;}
	this.featureImage=this.thumbImage.getElementsByTagName("img")[0]; //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
	}
},

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.thumbDescr.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;
	this.thumbDescr=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].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");