function ImageExpander(oThumb, sImgSrc)
{
	// store thumbnail image and overwrite its onclick handler.
	this.oThumb = oThumb;
	this.oThumb.expander = this;
	this.oThumb.onclick = function() { this.expander.expand(); }

	// record original size
	this.smallWidth = oThumb.offsetWidth;
	this.smallHeight = oThumb.offsetHeight;

	this.bExpand = true;
	this.bTicks = false;

	// self organized list
	if ( !window.aImageExpanders )
	{
		window.aImageExpanders = new Array();
	}
	window.aImageExpanders.push(this);

	// create the full sized image.


	this.oImg = new Image();
	this.oImg.expander = this;
	this.oImg.onload = function(){this.expander.onload();}
	this.oImg.src = sImgSrc;
}

ImageExpander.prototype.onload = function()
{
	this.oDiv = document.createElement("div");

  this.oDesc = document.createElement("div");
  this.oDesc.innerHTML=this.oThumb.title;



	this.oDiv.style.position = "absolute";
  this.oDiv.style.padding="2px";
  this.oDiv.style.border="1px solid black";
  this.oDiv.style.backgroundColor = "white";
  this.oDesc.style.textAlign = "center";
  this.oDiv.style.textAlign = "center";
  this.oDiv.style.overflow = "hidden";
  this.oDesc.style.color = "black";

  this.oDescHeight = 0;
  this.oDesc.style.fontSize="0px";

  this.oDiv.style.visibility = "hidden";
  this.oDiv.style.zIndex = "13";
	this.oImg.style.visibility = "hidden";

	this.oImg.style.width = "0px";
	this.oImg.style.height = "0px";

	this.oDiv.expander = this;
	this.oDiv.onclick = function() {this.expander.toggle();};
	this.oImg.title = "Klikněte ke zmenšení";
	this.bigWidth = this.oImg.width;
	this.bigHeight = this.oImg.height;



  this.oDiv.appendChild(this.oImg);
  this.oDiv.appendChild(this.oDesc);
  document.body.appendChild(this.oDiv);


	if ( this.bExpand )
	{
		this.expand();
	}
	else
	{
		this.oDiv.style.visibility = "hidden";
		this.oImg.style.visibility = "hidden";
	}
}
ImageExpander.prototype.toggle = function()
{
	this.bExpand = !this.bExpand;
	if ( this.bExpand )
	{
		for ( var i in window.aImageExpanders )
			if ( window.aImageExpanders[i] !== this )
				window.aImageExpanders[i].reduce();
	}
}
ImageExpander.prototype.expand = function()
{
	// set direction of expansion.
	this.bExpand = true;

	// set all other images to reduce
	for ( var i in window.aImageExpanders )
		if ( window.aImageExpanders[i] !== this )
			window.aImageExpanders[i].reduce();

	// if not loaded, don't continue just yet
	if ( !this.oDiv ) return;

	// hide the thumbnail
	this.oThumb.style.visibility = "hidden";

	// calculate initial dimensions
	this.x = this.oThumb.offsetLeft;
	this.y = this.oThumb.offsetTop;
	this.w = this.oThumb.clientWidth;
	this.h = this.oThumb.clientHeight;

  if (navigator.appName == "Microsoft Internet Explorer")
  {
    // calculate initial dimensions
  	this.x += document.getElementById("page").offsetLeft;
  	this.y += document.getElementById("page").offsetTop;
    this.x += document.getElementById("textmain").offsetLeft;
    this.y += document.getElementById("textmain").offsetTop;
    this.x += document.getElementById("pageHolder").offsetLeft;
    this.y += document.getElementById("pageHolder").offsetTop;

  }




	this.oDesc.style.width = this.w + "px";
  this.oDiv.style.width = this.w + "px";
	this.oDiv.style.left = this.x + "px";
	this.oDiv.style.top = this.y + "px";
	this.oImg.style.width = this.w + "px";
	this.oImg.style.height = this.h + "px";
	this.oDiv.style.visibility = "visible";
	this.oImg.style.visibility = "visible";


	// start the animation engine.
	if ( !this.bTicks )
	{
		this.bTicks = true;
		var pThis = this;
		window.setTimeout(function(){pThis.tick();},25);
	}
}
ImageExpander.prototype.reduce = function()
{
	// set direction of expansion.
	this.bExpand = false;
}
ImageExpander.prototype.tick = function()
{
	// calculate screen dimensions
	var cw = document.body.clientWidth;
	var ch = document.body.clientHeight - this.oDesc.offsetHeight-10;
	var cx = document.body.scrollLeft + cw / 2;
	var cy = this.oThumb.offsetTop ;
  if (navigator.appName == "Microsoft Internet Explorer")
  {
    // calculate initial dimensions

  	cy += document.getElementById("page").offsetTop;
    cy += document.getElementById("textmain").offsetTop;
    cy += document.getElementById("pageHolder").offsetTop;

  }


	// calculate target
	var tw,th,tx,ty;
	if ( this.bExpand )
	{
		tw = this.bigWidth;
		th = this.bigHeight;
		if ( tw > cw )
		{
			th *= cw / tw;
			tw = cw;
		}
		if ( th > ch )
		{
			tw *= ch / th;
			th = ch;
		}
		tx = cx - tw / 2;
		ty = cy - th / 2;

    if(this.oDescHeight <12)
      this.oDescHeight++;
	}
	else
	{
		tw = this.smallWidth;
		th = this.smallHeight;
		tx = this.oThumb.offsetLeft;
		ty = this.oThumb.offsetTop;
    if (navigator.appName == "Microsoft Internet Explorer")
    {
      // calculate initial dimensions
    	tx += document.getElementById("page").offsetLeft;
    	ty += document.getElementById("page").offsetTop;
      tx += document.getElementById("textmain").offsetLeft;
    	ty += document.getElementById("textmain").offsetTop;
      tx += document.getElementById("pageHolder").offsetLeft;
      ty += document.getElementById("pageHolder").offsetTop;

    }
    if(this.oDescHeight >0)
      this.oDescHeight--;
	}
	// move 5% closer to target
	var nHit = 0;
	var fMove = function(n,tn)
	{
		var dn = tn - n;
		if ( Math.abs(dn) < 3 )
		{
			nHit++;
			return tn;
		}
		else
		{
			return n + dn / 5;
		}
	}
	this.x = fMove(this.x, tx);
	this.y = fMove(this.y, ty);
	this.w = fMove(this.w, tw);
	this.h = fMove(this.h, th);



	this.oDesc.style.width = this.w + "px";
  this.oDiv.style.width = this.w + "px";
  this.oDiv.style.left = this.x + "px";
  this.oDiv.style.top = this.y + "px";
  this.oImg.style.width = this.w + "px";
  this.oImg.style.height = this.h + "px";
  this.oDesc.style.fontSize = this.oDescHeight + "px";



	// if reducing and size/position is a match, stop the tick
	if ( !this.bExpand && (nHit == 4) )
	{
		this.oImg.style.visibility = "hidden";
		this.oDiv.style.visibility = "hidden";
		this.oThumb.style.visibility = "visible";

		this.bTicks = false;
	}

	if ( this.bTicks )
	{
		var pThis = this;
		window.setTimeout(function(){pThis.tick();},25);
	}
}