// Image rollovers

var lrollover = true;

var hasImages = !(!document.images);
var isNav = !(!document.layers)
var _definedButtons;
if (hasImages)
	_definedButtons = new Array();


// "public" functions
	function buttonOn(which)
		{
			if (hasImages && !(!_definedButtons[which]))
				_definedButtons[which].on();
		}
	
	function buttonOff(which)
		{
			if (hasImages && !(!_definedButtons[which]))
				_definedButtons[which].off();
		}
	
	function getImageName(theString)
		{
			theString = String(theString);
			var retStr = new String();
			
			if (theString.indexOf(".") != -1)
				retStr = theString.substring(theString.lastIndexOf(".") + 1);
			else
				retStr = theString;
			return retStr;
		}
	
// "private" functions
	function _buttonOn()
		{
			if (hasImages)
				{
					if (!(!this.onImage))
						this.set(this.onImage.src);
					
					for (button in this.others)
						{
							this.others[button]["image"].src = this.others[button]["on"].src;
						}
				}
			
			if (this.onStatus != null)
				self.status = this.onStatus;
			
			return (true);
		}
	
	function _buttonOff()
		{
			if (hasImages)
				{
					if (!(!this.offImage))
						this.set(this.offImage.src);
					
					for (button in this.others)
						{
							this.others[button]["image"].src = this.others[button]["off"].src;
						}
				}
			
			if (this.offStatus != null)
				self.status = this.offStatus;
			else
				self.status = self.defaultStatus;
			
			return (true);
		}
	
	function _buttonActive()
		{
			if (hasImages)
				this.set(this.activeImage.src);
			
			return (true);
		}
	
	function _buttonAdd(imageObj, offSrc, onSrc)
		{
			if (hasImages)
				{
					var rollover = new Array();
					rollover["image"] = imageObj;
					var offImage = new Image();
					offImage.src = offSrc;
					rollover["off"] = offImage;
					var onImage = new Image();
					onImage.src = onSrc;
					rollover["on"] = onImage;
					this.others[this.others.length] = rollover;
				}
			return (true);
		}

	function _buttonGetImage()
		{
			if (typeof(this.image) == "string")
				return eval(this.image);
			else
				return this.image;
		}
	
	function _buttonSetImage(src)
		{
			var image = this.get();
			image.src = src;
		}
	
// Button "object"
	function Button(imageObj, offSrc, onSrc, activeSrc, offStatus, onStatus) {
	this.image = null;
	this.others = null;

	this.offImage = null;
	this.offStatus = null;

	this.onImage = null;
	this.onStatus = null;
	
	if (hasImages)
		{
			if (typeof(imageObj) == "string")
				{
					if (isNav)
						this.image = eval(imageObj);
					else
						this.image = document[getImageName(imageObj)];
				}
			else
				{
					this.image = imageObj;
				}
			
			this.others = new Array();
			this.offImage = null;
			this.onImage = null;
			this.activeImage = null;
			
			if (offSrc != null)
				{
					this.offImage = new Image();
					this.offImage.src = offSrc;
					this.offStatus = offStatus;
				}
			
			if (onSrc != null)
				{
					this.onImage = new Image();
					this.onImage.src = onSrc;
					this.onStatus = onStatus;
				}
			
			if (activeSrc != null)
				{
					this.activeImage = new Image();
					this.activeImage.src = activeSrc;
				}
			
			_definedButtons[this.image.name] = this;
		}
	
	Button.prototype.on			= _buttonOn;
	Button.prototype.off		= _buttonOff;
	Button.prototype.active		= _buttonActive;
	Button.prototype.add		= _buttonAdd;
	Button.prototype.get		= _buttonGetImage;
	Button.prototype.set		= _buttonSetImage;

	if (this.image != null)
		this.off();
}