// JScript File used for image display

var imageviewer=
{
  enableTitle: true, 
  enableAnimation: true,
  defineheader: '<div class="headerbar">CLOSE X</div>',
  defineLoading: '<img src="images/loading.gif" /> Loading Image...',
  scrollbarwidth: 16,
  opacitystring: 'filter:progid:DXImageTransform.Microsoft.alpha(opacity=10); -moz-opacity: 0.1; opacity: 0.1',
  targetlinks:[],

  createthumbBox:function()
  {    
    document.write('<div id="thumbBox" onClick="imageviewer.closeit()">'+this.defineheader+'<div id="thumbImage"></div></div>');
    document.write('<div id="thumbLoading">'+this.defineLoading+'</div>');
    this.thumbBox=document.getElementById("thumbBox");
    this.thumbImage=document.getElementById("thumbImage");
    this.thumbLoading=document.getElementById("thumbLoading");
    this.standardbody=(document.compatMode=="CSS1Compat")? document.documentElement : document.body;
  },

  centerDiv:function(divobj)
  {
    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;
    var objwidth=divobj.offsetWidth;
    var objheight=divobj.offsetHeight;
    var topposition=(docheight>objheight)? scroll_top+docheight/2-objheight/2+"px" : scroll_top+10+"px";
    divobj.style.left=docwidth/2-objwidth/2+"px";
    divobj.style.top=Math.floor(parseInt(topposition))+"px";
    divobj.style.visibility="visible";
  },

  showthumbBox:function()
  { 
    this.centerDiv(this.thumbBox);
    
    if (this.enableAnimation)
    {
      this.currentopacity=0.1;
      this.opacitytimer=setInterval("imageviewer.opacityanimation()", 20);
    }
  },


  loadimage:function(link)
  {
    if (this.thumbBox.style.visibility=="visible")
      this.closeit();
    var imageHTML='<img src="'+link.getAttribute("href")+'" style="'+this.opacitystring+'" />'; 
    if (this.enableTitle && link.getAttribute("title"))
      imageHTML+='<br />'+link.getAttribute("title");    
    this.centerDiv(this.thumbLoading);
    this.thumbImage.innerHTML=imageHTML;
    this.featureImage=this.thumbImage.getElementsByTagName("img")[0];
    this.featureImage.onload=function() 
    {
      imageviewer.thumbLoading.style.visibility="hidden";
      imageviewer.showthumbBox();
    }
    if (document.all && !window.createPopup)
      this.featureImage.src=link.getAttribute("href");
    this.featureImage.onerror=function()
    {
      imageviewer.thumbLoading.style.visibility="hidden";
    }
  },

  setimgopacity:function(value)
  {
    var targetobject=this.featureImage;
    if (targetobject.filters && targetobject.filters[0])
    {
      if (typeof targetobject.filters[0].opacity=="number")
        targetobject.filters[0].opacity=value*100;
      else
        targetobject.style.filter="alpha(opacity="+value*100+")";
    } else if (typeof targetobject.style.MozOpacity!="undefined")
      targetobject.style.MozOpacity=value;
    else if (typeof targetobject.style.opacity!="undefined")
      targetobject.style.opacity=value;
    else
      this.stopanimation();
  },

  opacityanimation: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()
  {
    this.stopanimation();
    this.thumbBox.style.visibility="hidden";
    this.thumbImage.innerHTML="";
    this.thumbBox.style.left="-2000px";
    this.thumbBox.style.top="-2000px";
  },

  cleanup:function()
  {
    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)
  {
    var tasktype=(window.addEventListener)? tasktype : "on"+tasktype;
    if (target.addEventListener)
      target.addEventListener(tasktype, functionref, false);
    else if (target.attachEvent)
      target.attachEvent(tasktype, functionref);
  },
	
	show:function(link) 
	{
		imageviewer.stopanimation();
    imageviewer.loadimage(link);
		return false;
	},

  init:function()
  {
    if (!this.enableAnimation)
      this.opacitystring="";
    var pagelinks=document.getElementsByTagName("a");
    for (var i=0; i<pagelinks.length; i++)
    {
      if (pagelinks[i].getAttribute("rel") && pagelinks[i].getAttribute("rel")=="thumbnail")
      {
        pagelinks[i].onclick=function()
        {
          imageviewer.stopanimation();
          imageviewer.loadimage(this);
          return false;
        }
        this.targetlinks[this.targetlinks.length]=pagelinks[i];
      }
    }
    
    this.dotask(window, function()
    {
    if (imageviewer.thumbBox.style.visibility=="visible") imageviewer.centerDiv(imageviewer.thumbBox)
    }, "resize");
  }
}

imageviewer.createthumbBox();
imageviewer.dotask(window, function(){imageviewer.init()}, "load");
imageviewer.dotask(window, function(){imageviewer.cleanup()}, "unload");