ÿþ// -------------------------------------------------------------------

// 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">
óng X</div>', //Define HTML for footer interface

defineLoading: '<img src="http://www.travelatvietnam.com/Images/loading_2.gif" /> Loading Image...', //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"></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+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(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

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=""

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")

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")