//<!--
var winW=800, winH=600;
function ImageExpander(oThumb, sImgSrc)
{
	// store thumbnail image and overwrite its onclick handler.
	if ( typeof(oThumb) == 'string' )
		this.oThumb = document.getElementById(oThumb);
	else
		this.oThumb = oThumb;
	
	this.oThumb.expander = this;
	this.oThumb.onclick = function() { this.expander.expand(); }
	
	if (parseInt(navigator.appVersion)>3) {
	 if (navigator.appName=="Netscape") {
	  winW = window.innerWidth;
	  winH = window.innerHeight;
	 }
	 if (navigator.appName.indexOf("Microsoft")!=-1) {
	  winW = document.body.offsetWidth;
	  winH = document.body.offsetHeight;
	 }
	}

	// record original size
	//this.smallWidth = oThumb.offsetWidth;
	//this.smallHeight = oThumb.offsetHeight;	
	this.smallWidth = this.oThumb.offsetWidth;
	this.smallHeight = this.oThumb.offsetHeight;		
	
	this.oLeft = this.oThumb.offsetLeft;
	this.oTop = this.oThumb.offsetTop;
	var t = findPos(this.oThumb);
	if (t)
	{
		this.oLeft = t[0,0];
		this.oTop = t[0,1];
	}
	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;
	//alert(this.oImg.src);
}
function findPos(obj)
{
	var curleft = curtop = 0;
	if (obj.offsetParent) 
	{
		do {
			curleft += obj.offsetLeft;
			curtop += obj.offsetTop;
		} while (obj = obj.offsetParent);
	}
	return [curleft,curtop];
}

ImageExpander.prototype.onload = function()
{
	//alert('loading');
	this.oDiv = document.createElement("div");
	document.body.appendChild(this.oDiv);
	this.oDiv.appendChild(this.oImg);
	this.oDiv.style.position = "absolute";
	this.oDiv.style.background = "#fff";
	this.oDiv.expander = this;
	this.oDiv.onclick = function() {this.expander.toggle();};
	this.oDiv.style.border = "solid 1px #444";
	this.oDiv.style.paddingBottom = "3px";
	this.oDiv.style.paddingLeft = "4px";
	this.oDiv.style.paddingRight = "4px";
	this.oDiv.style.paddingTop = "4px";
	this.oImg.title = "Click to reduce.";
	this.bigWidth = this.oImg.width;
	this.bigHeight = this.oImg.height;
	
	if ( this.bExpand )
	{
		//alert('expanding');
		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.oLeft; // this.oThumb.offsetLeft;
	this.y = this.oTop; //this.oThumb.offsetTop;
	this.w = this.oThumb.clientWidth;
	this.h = this.oThumb.clientHeight;
	
	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;
	var cx = this.oLeft + this.smallWidth / 2; //document.body.scrollLeft + cw / 2;
	var cy = this.oTop + this.smallHeight / 2; //document.body.scrollTop + ch / 2;
	if ( this.oLeft < ((winW/2)-150) )
		cx = this.oLeft + (this.bigWidth/2);
	//var cy = this.oTop + document.body.scrollTop + ch / 2;
	// 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; 
	}
	else
	{
		tw = this.smallWidth;
		th = this.smallHeight;
		tx = this.oLeft; // this.oThumb.offsetLeft;
		ty = this.oTop; // this.oThumb.offsetTop;
	}	
	// 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 / 10;
		}
	}
	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.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";

	// 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);
	}
}
//-->