// -------------------------------------------------------------------
// 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: false, //Should "title" attribute of link be used as description?
enableAnimation: true, //Enable fading animation?
definefooter: '<div id="footerbar"><div class="befaft"><span id="before">before</span><span id="after">after</span></div><div class="imgnav"><a href="javascript:void(0);" id="prev"></a><span id="x_of">1</span> of <span id="tot_pgs">10</span><a href="javascript:void(0);" id="next"></div><a href="javascript:void(0);" onClick="thumbnailviewer.newcloseit()" class="close"></a></div>', //Define HTML for footer interface

/////////////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"
linkarray:[],
totalLinks: 0,
curpg: 1,

createthumbBox:function(){
//write out HTML for Image Thumbnail Viewer plus loading div
document.write('<div id="thumbBox"><div id="thumbImage"></div><div id="img_title"></div>'+this.definefooter+'</div>')
document.write('<div id="thumbLoading">Loading Image <img src="images/bl_loading.gif" /></div>')
document.write('<div id="coverall"></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
this.coverAll=document.getElementById("coverall")
},


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)
}
},

loadimage:function(link){
	thumbnailviewer.coverAll.style.visibility="visible"
	thumbnailviewer.oldloadimage(link);
	for (var i=0; i<this.linkarray.length; i++){
		if(this.linkarray[i] == link){
			break;
		}
	}
	this.curpg = i+1;
	//set the current page display
	document.getElementById("x_of").innerHTML = String(this.curpg);
	
	//check to see what page it is and change navigation functions accordingly
	if(this.curpg == 1){
		document.getElementById("prev").style.visibility = "hidden";
		document.getElementById("prev").onclick = function(){
			return false;
		};
	} else {
		document.getElementById("prev").style.visibility = "visible";
		document.getElementById("prev").onclick = function(){
			thumbnailviewer.loadimage(thumbnailviewer.linkarray[thumbnailviewer.curpg-2]);
			this.blur();
		};
	}
	if(this.curpg == this.totalLinks){
		document.getElementById("next").style.visibility = "hidden";
		document.getElementById("next").onclick = function(){
			return false;
		};
	} else {
		document.getElementById("next").style.visibility = "visible";
		document.getElementById("next").onclick = function(){
			thumbnailviewer.loadimage(thumbnailviewer.linkarray[thumbnailviewer.curpg]);
			this.blur();
		};
	}
	
	//check to see if this is a before or after shot
	var title = String();
	title = link.getAttribute("title");
	if(title && (title.indexOf("(Before)") != -1)){
		document.getElementById("before").className = "a";
		document.getElementById("after").className = "";
	} else if(title && (title.indexOf("(After)") != -1)){
		document.getElementById("after").className = "a";
		document.getElementById("before").className = "";
	} else {
		document.getElementById("before").className = "";
		document.getElementById("after").className = "";
	}
	document.getElementById("img_title").innerHTML = title;
},

oldloadimage: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
	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)
},

newcloseit:function(){
	this.coverAll.style.visibility="hidden"
	this.closeit()
},

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.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")
var e=0;
for (var i=0; i<pagelinks.length; i++){ //BEGIN FOR LOOP
	if (pagelinks[i].getAttribute("rel") && pagelinks[i].getAttribute("rel")=="thumbnail"){ //Begin if statement
		this.linkarray[e]=pagelinks[i]
		e++
		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
this.totalLinks=e
document.getElementById("tot_pgs").innerHTML = String(e);
//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")