// -------------------------------------------------------------------
// Image Thumbnail Viewer Script- By Dynamic Drive, available at: http://www.dynamicdrive.com
// Last updated: Jan 22nd, 2007
// -------------------------------------------------------------------



var thumbnailviewer={
enableTitle: true, //Should "title" attribute of link be used as description?
enableAnimation: true, //Enable fading animation?
definefooter: '<div id="footerbar"><img src="images/blueview.jpg" /></div>', //Define HTML for footer interface
defineLoading: '<img src="images/loading-rev.gif" />', //Define HTML for "loading" div
subtop: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"

createthumbBox:function(){
//write out HTML for Image Thumbnail Viewer plus loading div
document.write('<div id="thumbBox" onmouseover="thupf()" onmouseout="thdown()" onClick="thumbnailviewer.closeit()" style="z-index:19"><div id="thumbImage"></div>'+this.definefooter+'</div>')
document.write('<div id="thumbLoading"><div id="thumbLoadingbox"></div><div id="thloadinside">'+this.defineLoading+'</div></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+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
if (this.enableAnimation){ //If fading animation enabled
this.currentopacity=0.1 //Starting opacity value
this.opacitytimer=setInterval("thumbnailviewer.opacityanimation()", 20)
}
thvars()
this.centerDiv(this.thumbBox)
},


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 id="image" src="'+link.getAttribute("href")+'" style="'+this.opacitystring+'" />' //Construct HTML for shown image
	if (this.enableTitle && link.getAttribute("desc")) //Use title attr of the link as description?
		imageHTML+='<div id="thumb_subtitle"></div><div id="thumb_subtitle_inner">'+link.getAttribute("desc")+"</div>"
	
	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
this.stopanimation()
this.thumbBox.style.visibility="hidden"
this.thumbImage.innerHTML=""
},

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].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")

var thtimer
var thtimeout=10
var thup=0
var thtop
var thinittop
var thtotaltop


function thvars(){
	var IE6 = false /*@cc_on || @_jscript_version < 5.7 @*/
	if (IE6){	
		document.getElementById('thumbImage').style.height = document.getElementById('image').scrollHeight + "px"
		document.getElementById('thumbImage').style.overflow = "hidden"
		document.getElementById('footerbar').style.width=document.getElementById('image').scrollWidth + "px"
		
		
		if (document.getElementById('thumb_subtitle')){
			document.getElementById('thumb_subtitle').style.width=document.getElementById('image').scrollWidth + "px"
			document.getElementById('thumb_subtitle_inner').style.width=document.getElementById('image').scrollWidth + "px"		
			thtotaltop = document.getElementById('thumb_subtitle_inner').scrollHeight 
			thtop = document.getElementById('image').scrollHeight
			thinittop = thtop
			document.getElementById('thumb_subtitle').style.height=thtotaltop+'px'	
		}
		
		document.getElementById('thumbBox').style.width=document.getElementById('image').scrollWidth + "px"
		document.getElementById('thumbImage').style.width=document.getElementById('image').scrollWidth + "px"
	} else {
		document.getElementById('thumbImage').style.height = document.getElementById('image').scrollHeight + "px"
		document.getElementById('thumbBox').style.width=document.getElementById('image').scrollWidth + "px"
		document.getElementById('thumbImage').style.width=document.getElementById('image').scrollWidth + "px"
		document.getElementById('footerbar').style.width=document.getElementById('image').scrollWidth + "px"
		
		if (document.getElementById('thumb_subtitle')){
			document.getElementById('thumb_subtitle').style.width=document.getElementById('image').scrollWidth + "px"
			document.getElementById('thumb_subtitle_inner').style.width=document.getElementById('image').scrollWidth + "px"
			
			thtotaltop = document.getElementById('thumb_subtitle_inner').scrollHeight 
			thtop = thumbnailviewer.thumbImage.scrollHeight - thtotaltop
			thinittop = thtop		
			document.getElementById('thumb_subtitle').style.height=thtotaltop+'px'
		}
		document.getElementById('thumbImage').style.overflow = "hidden"
	}
}

function thupf(){

	thup = 1;
	thover();
}
function thdown(){

	thup = 0;
	thout();
}
function thover(){
	clearTimeout(thtimer);
	if ((thtop > (thinittop-thtotaltop)) && (thup == 1)) {
		thtop=thtop-1;	
		document.getElementById('thumb_subtitle').style.top=thtop+'px';
		document.getElementById('thumb_subtitle_inner').style.top=thtop+'px';
		thtimer = setTimeout('thover()',thtimeout);
	}
	
}

function thout(){
	clearTimeout(thtimer);
	if ((thtop < thinittop) && (thup == 0)) {
		thtop=thtop+1;	
		document.getElementById('thumb_subtitle').style.top=thtop+'px';
		document.getElementById('thumb_subtitle_inner').style.top=thtop+'px';
		thtimer = setTimeout('thout()',thtimeout);
	}

}