// Copyright (c) 2006. Adobe Systems Incorporated.
// All rights reserved.

var Spry;

if (!Spry) Spry = {};

Spry.forwards = 1; // const
Spry.backwards = 2; // const

Spry.linearTransition = 1; // const
Spry.sinusoidalTransition = 2; // const

if (!Spry.Effect) Spry.Effect = {};

//////////////////////////////////////////////////////////////////////
//
// Spry.Effect.Registry
//
//////////////////////////////////////////////////////////////////////

Spry.Effect.Registry = function()
{
	this.elements = new Array();

	_AnimatedElement = function (element) 
	{
		this.element = element;
		this.currentEffect = -1;
		this.effectArray = new Array();
	};
	
	this.AnimatedElement = _AnimatedElement;

};
 
Spry.Effect.Registry.prototype.getRegisteredEffect = function(element, effect) 
{
	var eleIdx = this.getIndexOfElement(element);

	if (eleIdx == -1)
	{
		this.elements[this.elements.length] = new this.AnimatedElement(element);
		eleIdx = this.elements.length - 1;
	}

	var foundEffectArrayIdx = -1;
	for (var i = 0; i < this.elements[eleIdx].effectArray.length; i++) 
	{
		if (this.elements[eleIdx].effectArray[i])
		{
			if (this.effectsAreTheSame(this.elements[eleIdx].effectArray[i], effect))
			{
				foundEffectArrayIdx = i;
				//this.elements[eleIdx].effectArray[i].reset();
				if (this.elements[eleIdx].effectArray[i].isRunning == true) {
					//Spry.Debug.trace('isRunning == true');
					this.elements[eleIdx].effectArray[i].cancel();
				}
				this.elements[eleIdx].currentEffect = i;
				if (this.elements[eleIdx].effectArray[i].options && (this.elements[eleIdx].effectArray[i].options.toggle != null)) {
					if (this.elements[eleIdx].effectArray[i].options.toggle == true)
						this.elements[eleIdx].effectArray[i].doToggle();
				} else { // same effect name (but no options or options.toggle field)
					this.elements[eleIdx].effectArray[i] = effect;
				}

				break;
			}
		}
	}

	if (foundEffectArrayIdx == -1) 
	{
		var currEffectIdx = this.elements[eleIdx].effectArray.length;
		this.elements[eleIdx].effectArray[currEffectIdx] = effect;
		this.elements[eleIdx].currentEffect = currEffectIdx;
	}

	var idx = this.elements[eleIdx].currentEffect;
	return this.elements[eleIdx].effectArray[idx];
}

Spry.Effect.Registry.prototype.getIndexOfElement = function(element)
{
	var registryIndex = -1;
	for (var i = 0; i < this.elements.length; i++)
	{
		if (this.elements[i]) {
			if (this.elements[i].element == element)
				registryIndex = i;
		}
	}
	return registryIndex;
}

Spry.Effect.Registry.prototype.effectsAreTheSame = function(effectA, effectB)
{
	if (effectA.name != effectB.name) 
		return false;

	if(effectA.effectsArray) // cluster effect
	{
		if (!effectB.effectsArray || effectA.effectsArray.length != effectB.effectsArray.length)
			return false;

		for (var i = 0; i < effectA.effectsArray.length; i++)
		{
			if(!Spry.Effect.Utils.optionsAreIdentical(effectA.effectsArray[i].effect.options, effectB.effectsArray[i].effect.options))
				return false;
		}
	}
	else // single effect
	{
		if(effectB.effectsArray || !Spry.Effect.Utils.optionsAreIdentical(effectA.options, effectB.options))
			return false;
	}

	return true;
}

var SpryRegistry = new Spry.Effect.Registry;

//////////////////////////////////////////////////////////////////////
//
// Spry.Effect.Utils
//
//////////////////////////////////////////////////////////////////////

if (!Spry.Effect.Utils) Spry.Effect.Utils = {};

Spry.Effect.Utils.showError = function(msg)
{
	alert('Spry.Effect ERR: ' + msg);
}

Spry.Effect.Utils.Position = function()
{
	this.x = 0; // left
	this.y = 0; // top
	this.units = "px";
}

Spry.Effect.Utils.Rectangle = function()
{
	this.width = 0;
	this.height = 0;
	this.units = "px";
}

Spry.Effect.Utils.PositionedRectangle = function()
{
	this.position = new Spry.Effect.Utils.Position;
	this.rectangle = new Spry.Effect.Utils.Rectangle;
}

Spry.Effect.Utils.intToHex = function(integerNum) 
{
	var result = integerNum.toString(16);
	if (result.length == 1) 
		result = "0" + result;
	return result;
}

Spry.Effect.Utils.hexToInt = function(hexStr) 
{
	return parseInt(hexStr, 16); 
}

Spry.Effect.Utils.rgb = function(redInt, greenInt, blueInt) 
{
	
	var redHex = Spry.Effect.Utils.intToHex(redInt);
	var greenHex = Spry.Effect.Utils.intToHex(greenInt);
	var blueHex = Spry.Effect.Utils.intToHex(blueInt);
	compositeColorHex = redHex.concat(greenHex, blueHex);
	compositeColorHex = '#' + compositeColorHex;
	return compositeColorHex;
}

Spry.Effect.Utils.camelize = function(stringToCamelize)
{
    var oStringList = stringToCamelize.split('-');
	var isFirstEntry = true;
	var camelizedString = '';

	for(var i=0; i < oStringList.length; i++)
	{
		if(oStringList[i].length>0)
		{
			if(isFirstEntry)
			{
				camelizedString = oStringList[i];
				isFirstEntry = false;
			}
			else
			{
				var s = oStringList[i];
      			camelizedString += s.charAt(0).toUpperCase() + s.substring(1);
			}
		}
	}

	return camelizedString;
}

Spry.Effect.Utils.isPercentValue = function(value) 
{
	var result = false;
	try
	{
		if (value.lastIndexOf("%") > 0)
			result = true;
	}
	catch (e) {}
	return result;
}

Spry.Effect.Utils.getPercentValue = function(value) 
{
	var result = 0;
	try
	{
		result = Number(value.substring(0, value.lastIndexOf("%")));
	}
	catch (e) {Spry.Effect.Utils.showError('Spry.Effect.Utils.getPercentValue: ' + e);}
	return result;
}

Spry.Effect.Utils.getPixelValue = function(value) 
{
	var result = 0;
	try
	{
		result = Number(value.substring(0, value.lastIndexOf("px")));
	}
	catch (e) {}
	return result;
}

Spry.Effect.Utils.getFirstChildElement = function(node)
{
	if (node)
	{
		var childCurr = node.firstChild;

		while (childCurr)
		{
			if (childCurr.nodeType == 1) // Node.ELEMENT_NODE
				return childCurr;

			childCurr = childCurr.nextSibling;
		}
	}

	return null;
};

Spry.Effect.Utils.fetchChildImages = function(startEltIn, targetImagesOut)
{
	if(!startEltIn  || startEltIn.nodeType != 1 || !targetImagesOut)
		return;

	if(startEltIn.hasChildNodes())
	{
		var childImages = startEltIn.getElementsByTagName('img')
		var imageCnt = childImages.length;
		for(var i=0; i<imageCnt; i++)
		{
			var imgCurr = childImages[i];
			var dimensionsCurr = Spry.Effect.getDimensions(imgCurr);
			targetImagesOut.push([imgCurr,dimensionsCurr.width,dimensionsCurr.height]);
		}
	}
}

Spry.Effect.Utils.optionsAreIdentical = function(optionsA, optionsB)
{
	if(optionsA == null && optionsB == null)
		return true;

	if(optionsA != null && optionsB != null)
	{
		var objectCountA = 0;
		var objectCountB = 0;

		for (var propA in optionsA) objectCountA++;
		for (var propB in optionsB) objectCountB++;

		if(objectCountA != objectCountB)
			return false;

		for (var prop in optionsA)
		{
			if (optionsA[prop] === undefined)
			{
				if(optionsB[prop] !== undefined)
					return false;
			}
			else if((optionsB[prop] === undefined) || (optionsA[prop] != optionsB[prop]))
			{
				return false;
			}
		}

		return true;
	}

	return false;
}

//////////////////////////////////////////////////////////////////////
//
// DHTML manipulation
//
//////////////////////////////////////////////////////////////////////

Spry.Effect.getElement = function(ele)
{
	var element = null;
	if (ele && typeof ele == "string")
		element = document.getElementById(ele);
	else
		element = ele;
	if (element == null) Spry.Effect.Utils.showError('Element "' + ele + '" not found.');
	return element;
	
}

Spry.Effect.getStyleProp = function(element, prop)
{
	var value;

	try
	{
		value = element.style[Spry.Effect.Utils.camelize(prop)];
		if (!value)
		{
		    // Removed because call of 'getComputedStyle' causes problems
		    // on safari and opera (mac only). The function returns the
		    // correct value but it seems that there occurs a timing issue.

			if (document.defaultView && document.defaultView.getComputedStyle) {
				var css = document.defaultView.getComputedStyle(element, null);
				value = css ? css.getPropertyValue(prop) : null;
			} else
				if (element.currentStyle) {
					value = element.currentStyle[Spry.Effect.Utils.camelize(prop)];
				}
		}
	}
	catch (e) {Spry.Effect.Utils.showError('Spry.Effect.getStyleProp: ' + e);}

	return value == 'auto' ? null : value;
};

Spry.Effect.getStylePropRegardlessOfDisplayState = function(element, prop, displayElement)
{
	var refElement = displayElement ? displayElement : element;
	var displayOrig = Spry.Effect.getStyleProp(refElement, 'display');
	var visibilityOrig = Spry.Effect.getStyleProp(refElement, 'visibility');

	if(displayOrig == 'none')
	{
		Spry.Effect.setStyleProp(refElement, 'visibility', 'hidden');
		Spry.Effect.setStyleProp(refElement, 'display', 'block');
	
		if(window.opera) // opera needs focus to calculate the size for hidden elements
			refElement.focus();
	}

	var styleProp = Spry.Effect.getStyleProp(element, prop);

	if(displayOrig == 'none') // reset the original values
	{
		Spry.Effect.setStyleProp(refElement, 'display', 'none');
		Spry.Effect.setStyleProp(refElement, 'visibility', visibilityOrig);
	}

	return styleProp;
};

Spry.Effect.setStyleProp = function(element, prop, value)
{
	try
	{
		element.style[Spry.Effect.Utils.camelize(prop)] = value;
	}
	catch (e) {Spry.Effect.Utils.showError('Spry.Effect.setStyleProp: ' + e);}

	return null;
};

Spry.Effect.makePositioned = function(element)
{
	var pos = Spry.Effect.getStyleProp(element, 'position');
	if (!pos || pos == 'static') {
		element.style.position = 'relative';

		// Opera returns the offset relative to the positioning context, when an
		// element is position relative but top and left have not been defined
		if (window.opera) {
			element.style.top = 0;
			element.style.left = 0;
		}
	}
}

Spry.Effect.isInvisible = function(element)
{
	var propDisplay = Spry.Effect.getStyleProp(element, 'display');
	if (propDisplay && propDisplay.toLowerCase() == 'none')
		return true;

	var propVisible = Spry.Effect.getStyleProp(element, 'visibility');
	if (propVisible && propVisible.toLowerCase() == 'hidden')
		return true;

	return false;
}

Spry.Effect.enforceVisible = function(element)
{
	var propDisplay = Spry.Effect.getStyleProp(element, 'display');
	if (propDisplay && propDisplay.toLowerCase() == 'none')
		Spry.Effect.setStyleProp(element, 'display', 'block');

	var propVisible = Spry.Effect.getStyleProp(element, 'visibility');
	if (propVisible && propVisible.toLowerCase() == 'hidden')
		Spry.Effect.setStyleProp(element, 'visibility', 'visible');
}

Spry.Effect.makeClipping = function(element) 
{
	var overflow = Spry.Effect.getStyleProp(element, 'overflow');
	if (overflow != 'hidden' && overflow != 'scroll')
	{
		// IE 7 bug: set overflow property to hidden changes the element height to 0
		// -> therefore we save the height before changing the overflow property and set the old size back
		var heightCache = 0;
		var needsCache = /MSIE 7.0/.test(navigator.userAgent) && /Windows NT/.test(navigator.userAgent);
		if(needsCache)
			heightCache = Spry.Effect.getDimensionsRegardlessOfDisplayState(element).height;

		Spry.Effect.setStyleProp(element, 'overflow', 'hidden');

		if(needsCache)
			Spry.Effect.setStyleProp(element, 'height', heightCache+'px');
	}
}

Spry.Effect.cleanWhitespace = function(element) 
{
	var childCountInit = element.childNodes.length;
    for (var i = childCountInit - 1; i >= 0; i--) {
      var node = element.childNodes[i];
      if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
	  {
		  try
		  {
		 	element.removeChild(node);
		  }
		  catch (e) {Spry.Effect.Utils.showError('Spry.Effect.cleanWhitespace: ' + e);}
	  }
    }
}

Spry.Effect.getComputedStyle = function(element)
{
	var computedStyle = /MSIE/.test(navigator.userAgent) ? element.currentStyle : document.defaultView.getComputedStyle(element, null);
	return computedStyle;
}

Spry.Effect.getDimensions = function(element)
{
	var dimensions = new Spry.Effect.Utils.Rectangle;
	var computedStyle = null;

	if (element.style.width && /px/i.test(element.style.width))
	{
		dimensions.width = parseInt(element.style.width); // without padding
	}
	else
	{
		computedStyle = Spry.Effect.getComputedStyle(element);
		var tryComputedStyle = computedStyle && computedStyle.width && /px/i.test(computedStyle.width);

		if (tryComputedStyle)
			dimensions.width = parseInt(computedStyle.width); // without padding, includes css

		if (!tryComputedStyle || dimensions.width == 0) // otherwise we might run into problems on safari and opera (mac only)
			dimensions.width = element.offsetWidth;   // includes padding
	}

	if (element.style.height && /px/i.test(element.style.height))
	{
		dimensions.height = parseInt(element.style.height); // without padding
	}
	else
	{
		if (!computedStyle)
			computedStyle = Spry.Effect.getComputedStyle(element);

        var tryComputedStyle = computedStyle && computedStyle.height && /px/i.test(computedStyle.height);

		if (tryComputedStyle)
			dimensions.height = parseInt(computedStyle.height); // without padding, includes css

		if(!tryComputedStyle || dimensions.height == 0) // otherwise we might run into problems on safari and opera (mac only)
			dimensions.height = element.offsetHeight;   // includes padding
	}

	return dimensions;
}

Spry.Effect.getDimensionsRegardlessOfDisplayState = function(element, displayElement)
{
	// If the displayElement display property is set to 'none', we temporarily set its
	// visibility state to 'hidden' to be able to calculate the dimension.

	var refElement = displayElement ? displayElement : element;
	var displayOrig = Spry.Effect.getStyleProp(refElement, 'display');
	var visibilityOrig = Spry.Effect.getStyleProp(refElement, 'visibility');

	if(displayOrig == 'none')
	{
		Spry.Effect.setStyleProp(refElement, 'visibility', 'hidden');
		Spry.Effect.setStyleProp(refElement, 'display', 'block');

		if(window.opera) // opera needs focus to calculate the size for hidden elements
			refElement.focus();
	}

	var dimensions = Spry.Effect.getDimensions(element);

	if(displayOrig == 'none') // reset the original values
	{
		Spry.Effect.setStyleProp(refElement, 'display', 'none');
		Spry.Effect.setStyleProp(refElement, 'visibility', visibilityOrig);
	}

	return dimensions;
}

Spry.Effect.getOpacity = function(element)
{
  var o = Spry.Effect.getStyleProp(element, "opacity");
  if (o == undefined || o == null)
    o = 1.0;
  return o;
}

Spry.Effect.getColor = function(element)
{
  var c = Spry.Effect.getStyleProp(ele, "background-color");
  return c;
}

Spry.Effect.getPosition = function(element)
{
	var position = new Spry.Effect.Utils.Position;
	var computedStyle = null;

	if (element.style.left  && /px/i.test(element.style.left))
	{
		position.x = parseInt(element.style.left); // without padding
	}
	else
	{
		computedStyle = Spry.Effect.getComputedStyle(element);
		var tryComputedStyle = computedStyle && computedStyle.left && /px/i.test(computedStyle.left);

		if (tryComputedStyle)
			position.x = parseInt(computedStyle.left); // without padding, includes css

		if(!tryComputedStyle || position.x == 0) // otherwise we might run into problems on safari and opera (mac only)
			position.x = element.offsetLeft;   // includes padding
	}

	if (element.style.top && /px/i.test(element.style.top))
	{
		position.y = parseInt(element.style.top); // without padding
	}
	else
	{
		if (!computedStyle)
			computedStyle = Spry.Effect.getComputedStyle(element);

        var tryComputedStyle = computedStyle && computedStyle.top && /px/i.test(computedStyle.top);

		if (tryComputedStyle)
			position.y = parseInt(computedStyle.top); // without padding, includes css

		if(!tryComputedStyle || position.y == 0) // otherwise we might run into problems on safari and opera (mac only)
			position.y = element.offsetTop;   // includes padding
	}

	return position;
}

Spry.Effect.getOffsetPosition = Spry.Effect.getPosition; // deprecated

//////////////////////////////////////////////////////////////////////
//
// Spry.Effect.Animator
// (base class)
//
//////////////////////////////////////////////////////////////////////

Spry.Effect.Animator = function(options)
{
	this.name = 'Animator';
	this.element = null;
	this.timer = null;
	this.direction = Spry.forwards;
	this.startMilliseconds = 0;
	this.repeat = 'none';
	this.isRunning = false;
	
	this.options = {
		duration: 500,
		toggle: false,
		transition: Spry.linearTransition,
		interval: 33 // ca. 30 fps
	};
	
	this.setOptions(options);

};

Spry.Effect.Animator.prototype.setOptions = function(options)
{
	if (!options)
		return;
	for (var prop in options)
		this.options[prop] = options[prop];
};

Spry.Effect.Animator.prototype.start = function(withoutTimer)
{
	if (arguments.length == 0)
		withoutTimer = false;
		
	var self = this;

	if (this.options.setup)
	{
		try
		{
			this.options.setup(this.element, this);
		}
		catch (e) {Spry.Effect.Utils.showError('Spry.Effect.Animator.prototype.start: setup callback: ' + e);}
	}
	
	this.prepareStart();

	var currDate = new Date();
	this.startMilliseconds = currDate.getTime();
	
	if (withoutTimer == false) {
		this.timer = setInterval(function() { self.drawEffect(); }, this.options.interval);
	}
	this.isRunning = true;

};

Spry.Effect.Animator.prototype.stop = function()
{
	if (this.timer) {
		clearInterval(this.timer);
		this.timer = null;
	}

	this.startMilliseconds = 0;

	if (this.options.finish)
	{
		try
		{
			this.options.finish(this.element, this);
		}
		catch (e) {Spry.Effect.Utils.showError('Spry.Effect.Animator.prototype.stop: finish callback: ' + e);}
	}
	this.isRunning = false;
	/*
	Spry.Debug.trace('after stop:' + this.name);
	Spry.Debug.trace('this.element.style.top: ' + this.element.style.top);
	Spry.Debug.trace('this.element.style.left: ' + this.element.style.left);
	Spry.Debug.trace('this.element.style.width: ' + this.element.style.width);
	Spry.Debug.trace('this.element.style.height: ' + this.element.style.height);
	*/
};

Spry.Effect.Animator.prototype.cancel = function()
{
	if (this.timer) {
		clearInterval(this.timer);
		this.timer = null;
	}
	this.isRunning = false;
}

Spry.Effect.Animator.prototype.drawEffect = function()
{
	var isRunning = true;

	var position = this.getElapsedMilliseconds() / this.options.duration;
	if (this.getElapsedMilliseconds() > this.options.duration) {
		position = 1.0;
	} else {
		if (this.options.transition == Spry.sinusoidalTransition)
		{
			position = (-Math.cos(position*Math.PI)/2) + 0.5;
		}
		else if (this.options.transition == Spry.linearTransition)
		{
			// default: linear
		}
		else
		{
			Spry.Effect.Utils.showError('unknown transition');
		}
		
	}
	//Spry.Debug.trace('position: ' + position + ' : ' + this.name + '(duration: ' + this.options.duration + 'elapsed: ' + this.getElapsedMilliseconds() + 'test: ' + this.startMilliseconds);
	this.animate(position);
	
	if (this.getElapsedMilliseconds() > this.options.duration) {
		this.stop();
		isRunning = false;
	}
	return isRunning;

};

Spry.Effect.Animator.prototype.getElapsedMilliseconds = function()
{
	if (this.startMilliseconds > 0) {
		var currDate = new Date();
		return (currDate.getTime() - this.startMilliseconds);
	} else {
		return 0;
	}
};

Spry.Effect.Animator.prototype.doToggle = function()
{
	if (this.options.toggle == true) {
		if (this.direction == Spry.forwards) {
			this.direction = Spry.backwards;
		} else if (this.direction == Spry.backwards) {
			this.direction = Spry.forwards;
		}
	}
}

Spry.Effect.Animator.prototype.prepareStart = function() {};

Spry.Effect.Animator.prototype.animate = function(position) {};

//////////////////////////////////////////////////////////////////////
//
// Spry.Effect.Size
//
//////////////////////////////////////////////////////////////////////

Spry.Effect.Size = function(element, fromRect, toRect, options)
{
	this.dynamicFromRect = false;
	if (arguments.length == 3)
	{
		options = toRect;
		toRect = fromRect;
		fromRect = Spry.Effect.getDimensionsRegardlessOfDisplayState(element);
		this.dynamicFromRect = true;
	}
	
	Spry.Effect.Animator.call(this, options);
	
	this.name = 'Size';
	this.element = Spry.Effect.getElement(element);

	if (fromRect.units != toRect.units)
		Spry.Effect.Utils.showError('Spry.Effect.Size: Conflicting units (' + fromRect.units + ', ' + toRect.units + ')');
		
	this.units = fromRect.units;

	var originalRect = Spry.Effect.getDimensionsRegardlessOfDisplayState(element);
	this.originalWidth = originalRect.width;

	this.startWidth = fromRect.width;
	this.startHeight = fromRect.height;
	this.stopWidth = toRect.width;
	this.stopHeight = toRect.height;
	this.childImages = new Array();

	if(this.options.scaleContent)
		Spry.Effect.Utils.fetchChildImages(element, this.childImages);

	this.fontFactor = 1.0;
	if(this.element.style && this.element.style.fontSize)
	{
		if(/em\s*$/.test(this.element.style.fontSize))
			this.fontFactor = parseFloat(this.element.style.fontSize);
	}

	if (Spry.Effect.Utils.isPercentValue(this.startWidth))
	{
		var startWidthPercent = Spry.Effect.Utils.getPercentValue(this.startWidth);
		//var originalRect = Spry.Effect.getDimensions(element);
		this.startWidth = originalRect.width * (startWidthPercent / 100);
	}

	if (Spry.Effect.Utils.isPercentValue(this.startHeight))
	{
		var startHeightPercent = Spry.Effect.Utils.getPercentValue(this.startHeight);
		//var originalRect = Spry.Effect.getDimensions(element);
		this.startHeight = originalRect.height * (startHeightPercent / 100);
	}

	if (Spry.Effect.Utils.isPercentValue(this.stopWidth))
	{
		var stopWidthPercent = Spry.Effect.Utils.getPercentValue(this.stopWidth);
		var originalRect = Spry.Effect.getDimensionsRegardlessOfDisplayState(element);
		this.stopWidth = originalRect.width * (stopWidthPercent / 100);
	}

	if (Spry.Effect.Utils.isPercentValue(this.stopHeight))
	{
		var stopHeightPercent = Spry.Effect.Utils.getPercentValue(this.stopHeight);
		var originalRect = Spry.Effect.getDimensionsRegardlessOfDisplayState(element);
		this.stopHeight = originalRect.height * (stopHeightPercent / 100);
	}

	this.widthRange = this.startWidth - this.stopWidth;
	this.heightRange = this.startHeight - this.stopHeight;

	this.enforceVisible = Spry.Effect.isInvisible(this.element);
};

Spry.Effect.Size.prototype = new Spry.Effect.Animator();
Spry.Effect.Size.prototype.constructor = Spry.Effect.Size;

Spry.Effect.Size.prototype.animate = function(position)
{
	var width = 0;
	var height = 0;
	var fontSize = 0;

	if (this.direction == Spry.forwards) {
		width = this.startWidth - (this.widthRange * position);
		height = this.startHeight - (this.heightRange * position);
		fontSize = this.fontFactor*(this.startWidth + position*(this.stopWidth - this.startWidth))/this.originalWidth;
	} else if (this.direction == Spry.backwards) {
		width = this.widthRange * position + this.stopWidth;
		height = this.heightRange * position + this.stopHeight;
		fontSize = this.fontFactor*(this.stopWidth + position*(this.startWidth - this.stopWidth))/this.originalWidth;
	}
	if (this.options.scaleContent == true)
		this.element.style.fontSize = fontSize + 'em';

	//Spry.Debug.trace(fontSize);

	this.element.style.width = width + this.units;
	this.element.style.height = height + this.units;

	if(this.options.scaleContent)
	{
		var propFactor = (this.direction == Spry.forwards) ? (this.startWidth + position*(this.stopWidth - this.startWidth))/this.originalWidth
														   : (this.stopWidth + position*(this.startWidth - this.stopWidth))/this.originalWidth;

		for(var i=0; i < this.childImages.length; i++)
		{
			this.childImages[i][0].style.width = propFactor * this.childImages[i][1] + this.units;
			this.childImages[i][0].style.height = propFactor * this.childImages[i][2] + this.units;
		}
	}

	if(this.enforceVisible)
	{
		Spry.Effect.enforceVisible(this.element);
		this.enforceVisible = false;
	}
};

Spry.Effect.Size.prototype.prepareStart = function() 
{
	if (this.dynamicFromRect == true)
	{
		var fromRect = Spry.Effect.getDimensions(element);
		this.startWidth = fromRect.width;
		this.startHeight = fromRect.height;
	
		this.widthRange = this.startWidth - this.stopWidth;
		this.heightRange = this.startHeight - this.stopHeight;
	}
};

//////////////////////////////////////////////////////////////////////
//
// Spry.Effect.Opacity
//
//////////////////////////////////////////////////////////////////////

Spry.Effect.Opacity = function(element, startOpacity, stopOpacity, options)
{
	this.dynamicStartOpacity = false;
	if (arguments.length == 3)
	{
		options = stopOpacity;
		stopOpacity = startOpacity;
		startOpacity = Spry.Effect.getOpacity(element);
		this.dynamicStartOpacity = true;
	}

	Spry.Effect.Animator.call(this, options);

	this.name = 'Opacity';
	this.element = Spry.Effect.getElement(element);

    // make this work on IE on elements without 'layout'
    if(/MSIE/.test(navigator.userAgent) && (!this.element.hasLayout))
	  Spry.Effect.setStyleProp(this.element, 'zoom', '1');

	this.startOpacity = startOpacity;
	this.stopOpacity = stopOpacity;
	this.opacityRange = this.startOpacity - this.stopOpacity;
	this.enforceVisible = Spry.Effect.isInvisible(this.element);
};

Spry.Effect.Opacity.prototype = new Spry.Effect.Animator();
Spry.Effect.Opacity.prototype.constructor = Spry.Effect.Opacity;

Spry.Effect.Opacity.prototype.animate = function(position)
{
	var opacity = 0;

	if (this.direction == Spry.forwards) {
		opacity = this.startOpacity - (this.opacityRange * position);
	} else if (this.direction == Spry.backwards) {
		opacity = this.opacityRange * position + this.stopOpacity;
	}
	
	this.element.style.opacity = opacity;
	this.element.style.filter = "alpha(opacity=" + Math.floor(opacity * 100) + ")";

	if(this.enforceVisible)
	{
		Spry.Effect.enforceVisible(this.element);
		this.enforceVisible = false;
	}
};

Spry.Effect.Size.prototype.prepareStart = function() 
{
	if (this.dynamicStartOpacity == true)
	{
		this.startOpacity = Spry.Effect.getOpacity(element);
		this.opacityRange = this.startOpacity - this.stopOpacity;
	}
};

//////////////////////////////////////////////////////////////////////
//
// Combination effects
// Custom effects can be build by combining basic effect bahaviour
// like Move, Size, Color, Opacity
//
//////////////////////////////////////////////////////////////////////

Spry.Effect.AppearFade = function (element, options) 
{
	var element = Spry.Effect.getElement(element);

	var durationInMilliseconds = 1000;
	var fromOpacity = 0.0;
	var toOpacity = 100.0;
	var doToggle = false;
	var kindOfTransition = Spry.sinusoidalTransition;
	var setupCallback = null;
	var finishCallback = null;

	if (options)
	{
		if (options.duration != null) durationInMilliseconds = options.duration;
		if (options.from != null) fromOpacity = options.from;
		if (options.to != null) toOpacity = options.to;
		if (options.toggle != null) doToggle = options.toggle;
		if (options.transition != null) kindOfTransition = options.transition;
		if (options.setup != null) setupCallback = options.setup;
		if (options.finish != null) finishCallback = options.finish;
	}
	options = {duration: durationInMilliseconds, toggle: doToggle, transition: kindOfTransition, setup: setupCallback, finish: finishCallback, from: fromOpacity, to: toOpacity};

	fromOpacity = fromOpacity/ 100.0;
	toOpacity = toOpacity / 100.0;

	var appearFadeEffect = new Spry.Effect.Opacity(element, fromOpacity, toOpacity, options);

	appearFadeEffect.name = 'AppearFade';
	var registeredEffect = SpryRegistry.getRegisteredEffect(element, appearFadeEffect);
	registeredEffect.start();
	return registeredEffect;
};


//////////////////////////////////////////////////////////////////////
//
// The names of some of the static effect functions will
// change in Spry 1.5. These wrappers will insure that we
// remain compatible with future versions of Spry.
//
//////////////////////////////////////////////////////////////////////

Spry.Effect.DoFade = function (element, options)
{
		return Spry.Effect.AppearFade(element, options);
};