// -------------------------------------------------------------------
// 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">LUK</div>', //Define HTML for footer interface
    defineLoading: '<img src="loading.gif" />Henter billed...', //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
        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){ //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)
    },


    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")