// -------------------------------------------------------------------
// 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 class="footerbar">CERRAR X</div>', //Define HTML for footer interface
	defineLoading: '<img src="images/loading_image.gif" align="absmiddle" /> Cargando Imagen...', //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 id="thumbImage" align="center"></div>'+this.definefooter+'</div>')
		document.write('<div id="thumbLoading" style="cursor:pointer; cursor:hand;" onClick="thumbnailviewer.closeit();">'+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+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
		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(imagen, titulo){ //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
		//alert(this.opacitystring);
		var imageHTML='<img src="'+imagen+'" style="'+this.opacitystring+'" />' //Construct HTML for shown image
		if (this.enableTitle && titulo!="") //Use title attr of the link as description?
			imageHTML+='<br />'+titulo
		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=imagen
		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)
			if (this.featureImage) {
				this.featureImage.style.filter="";
				this.featureImage.style.MozOpacity="";
				this.featureImage.style.opacity="";
			}
		}
	},


	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"
		this.thumbLoading.style.visibility="hidden"
		if (this.featureImage) this.featureImage.onload=null
			this.featureImage=null
	},
	
	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)
	},
	
	mostrar:function(imagen, titulo){ //Initialize thumbnail viewer script by scanning page and attaching appropriate function to links with rel="thumbnail"
		if (!this.enableAnimation)
			this.opacitystring=""
		thumbnailviewer.stopanimation();
		if (typeof(titulo)=="undefined") titulo="";
		thumbnailviewer.loadimage(imagen, titulo)
		//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.cleanup()}, "unload")