// Create scrolling variable if it doesn't exist
if (!Scrolling) var Scrolling = {};

//Scrollbar constructor
Scrolling.Scrollbar = function(o, s, t) {
	//private variables
	var self = this;
	var _components = {};
	var _dimensions = {};
	var _temporary = {};
	var _hasTween = t ? true : false;
	var _timer, _ratio;

	//public variables
	this.onMouseDown = function() { };
	this.onMouseUp = function() { };
	this.onScroll = function() { };
	this.scrollAmount = 5;
	this.scrollSpeed = 30;
	this.disabled = false;

	//private functions
	function initialize() {
		var c = _components;
		var d = _dimensions;
		var g = s.getDimensions();

		c.up = findComponent("Scrollbar-Up", o);
		c.down = findComponent("Scrollbar-Down", o);
		c.track = findComponent("Scrollbar-Track", o);
		c.handle = findComponent("Scrollbar-Handle", c.track);
		//c.handle = findComponent("Scrollbar-Handle", o);

		d.trackTop = findOffsetTop(c.track);
		d.trackHeight = c.track.offsetHeight;
		d.handleHeight = c.handle.offsetHeight;
		if (d.trackHeight == 0) {
			d.trackTop = 225;
			d.trackHeight = 300;
			d.handleHeight = 14;
		}
		d.y = 0;

		if (_hasTween) t.apply(self);

		//removeEvent(s.getContent(), "mousewheel", scrollbarWheel);
		addEvent(s.getContent(), "mousewheel", scrollbarWheel);
		addEvent(s.getContent(), "DOMMouseScroll", scrollbarWheel);
		addEvent(o, "mousedown", scrollbarClickPrimer);

		self.reset();
	};

	function findOffsetTop(o) {
		var t = 0;
		if (o.offsetParent) {
			while (o.offsetParent) {
				t += o.offsetTop;
				o = o.offsetParent;
			}
		}
		return t;
	};

	function addEvent(o, t, f) {
		removeEvent(o, t, f);
		if (o.attachEvent) o.attachEvent('on' + t, f);
		else o.addEventListener(t, f, false);
	};

	function removeEvent(o, t, f) {
		if (o.detachEvent) o.detachEvent('on' + t, f);
		else o.removeEventListener(t, f, false);
	};

	this.removeScrollEvents = function() {
		removeEvent(s.getContent(), "mousewheel", scrollbarWheel);
		removeEvent(s.getContent(), "mousewheel", scrollbarWheel);
		removeEvent(s.getContent(), "DOMMouseScroll", scrollbarWheel);
		removeEvent(o, "mousedown", scrollbarClickPrimer);
	};

	function findComponent(c, o) {
		var kids = o.childNodes;
		for (var i = 0; i < kids.length; i++) {
			if (kids[i].className && kids[i].className.indexOf(c) >= 0) {
				return kids[i];
			}
		}
	};

	function scroll(y) {
		if (y < 0) y = 0;
		if (y > _dimensions.trackHeight - _dimensions.handleHeight)
			y = _dimensions.trackHeight - _dimensions.handleHeight;


		_components.handle.style.top = y + "px";
		_dimensions.y = y;

		s.scrollTo(0, Math.round(_dimensions.y * _ratio));
		self.onScroll();
	};

	function scrollbarClickPrimer(e) {
		if (self.disabled) return false;

		e = e ? e : event;
		if (!e.target) e.target = e.srcElement;

		_dimensions.trackTop = findOffsetTop(_components.track);
		scrollbarClick(e.target.className, e);
	};

	function scrollbarClick(c, e) {
		var d = _dimensions;
		var t = _temporary;
		var cy = e.clientY + document.body.scrollTop;

		if (c.indexOf("Scrollbar-Up") >= 0)
			startScroll(-self.scrollAmount);

		if (c.indexOf("Scrollbar-Down") >= 0)
			startScroll(self.scrollAmount);

		if (c.indexOf("Scrollbar-Track") >= 0)
			if (_hasTween) self.tweenTo((cy - d.trackTop - d.handleHeight / 2) * _ratio);
		else scroll(cy - d.trackTop - d.handleHeight / 2);

		if (c.indexOf("Scrollbar-Handle") >= 0) {
			t.grabPoint = cy - findOffsetTop(_components.handle);
			addEvent(document, "mousemove", scrollbarDrag, false);
		}

		t.target = e.target;
		t.select = document.onselectstart;

		document.onselectstart = function() { return false; };
		self.onMouseDown(e.target, c, e);

		addEvent(document, "mouseup", stopScroll);
	};

	function scrollbarDrag(e) {
		e = e ? e : event;
		var d = _dimensions;
		var t = parseInt(_components.handle.style.top);
		var v = e.clientY + document.body.scrollTop - d.trackTop;

		if (v >= d.trackHeight - d.handleHeight + _temporary.grabPoint)
			v = d.trackHeight - d.handleHeight;

		else if (v <= _temporary.grabPoint)
			v = 0;

		else v = v - _temporary.grabPoint;

		scroll(v);
	};

	function scrollbarWheel(e) {
		if (self.disabled) return false;

		e = e ? e : event;
		var dir = 0;

		if (typeof e.wheelDelta == 'undefined') {
			if (e.detail > 0) dir = 1;
			if (e.detail < 0) dir = -1;
		} else {
			if (e.wheelDelta >= 120) dir = -1;
			if (e.wheelDelta <= -120) dir = 1;
		}

		self.scrollBy(dir * 20);

		if (e.stopPropagation) e.stopPropagation();
		if (e.preventDefault) e.preventDefault();
		e.cancelBubble = true;
		e.cancel = true;
		e.returnValue = false;
		return false;
	};

	function startScroll(y) {
		_temporary.disty = y;
		_timer = window.setInterval(function() {
			self.scrollBy(_temporary.disty);
		}, self.scrollSpeed);
	};

	function stopScroll(e) {
		e = e ? e : event;

		removeEvent(document, "mousemove", scrollbarDrag);
		removeEvent(document, "mouseup", stopScroll);

		document.onselectstart = _temporary.select;
		if (_timer) window.clearInterval(_timer);

		self.onMouseUp(_temporary.target, _temporary.target.className, e);
	};

	//public functions
	this.reset = function() {
		var d = _dimensions;
		var c = _components;
		var g = s.getDimensions();

		//g.theight = 340;
		/*if (d.trackHeight == 0) {
		d.trackHeight = 300;
		d.handleHeight = 14;
		}*/
		_ratio = (g.theight - g.vheight) / (d.trackHeight - d.handleHeight);
		//_ratio = 1.0;
		//_ratio = ((g.theight - g.vheight) / (d.trackHeight - d.handleHeight)) / 9;
		//_ratio = 1.0;


		c.handle.ondragstart = function() { return false; };
		c.handle.onmousedown = function() { return false; };
		c.handle.style.top = "0px";
		d.y = 0;

		s.reset();
		scroll(0);

		if (g.theight < g.vheight) {
			this.disable()
		} else this.enable();
	};

	this.reset3 = function() {
		var d = _dimensions;
		var c = _components;
		var g = s.getDimensions();

		//g.theight = 340;
		d.trackHeight = 300;
		d.handleHeight = 14;
		_ratio = (g.theight - g.vheight) / (d.trackHeight - d.handleHeight);
		//_ratio = ((g.theight - g.vheight) / (d.trackHeight - d.handleHeight)) / 9;
		//_ratio = 1.0;


		c.handle.ondragstart = function() { return false; };
		c.handle.onmousedown = function() { return false; };
		c.handle.style.top = "0px";
		d.y = 0;

		s.reset();
		scroll(0);

		if (g.theight < g.vheight) {
			self.disable()
		} else self.enable();
	};

	this.reset2 = function() {
		setTimeout(this.reset3, 1000);
		/*var d = _dimensions;
		var c = _components;
		var g = s.getDimensions();

		//g.theight = 340;
		_ratio = (g.theight - g.vheight) / (d.trackHeight - d.handleHeight);
		//_ratio = ((g.theight - g.vheight) / (d.trackHeight - d.handleHeight)) / 9;
		//_ratio = 1.0;


		//c.handle.ondragstart = function() { return false; };
		//c.handle.onmousedown = function() { return false; };
		c.handle.style.top = "0px";
		d.y = 0;

		s.reset();
		scroll(0);

		if (g.theight < g.vheight) {
		this.disable()
		} else this.enable();

		//s.scrollTo(0, 0);

		/*s.reset();
		scroll(0);

		if (g.theight < g.vheight) {
		this.disable()
		} else this.enable();*/
	};

	this.init = function() {
		var c = _components;
		var d = _dimensions;
		var g = s.getDimensions();

		c.up = findComponent("Scrollbar-Up", o);
		c.down = findComponent("Scrollbar-Down", o);
		c.track = findComponent("Scrollbar-Track", o);
		c.handle = findComponent("Scrollbar-Handle", c.track);

		d.trackTop = findOffsetTop(c.track);
		d.trackHeight = c.track.offsetHeight;
		d.handleHeight = c.handle.offsetHeight;
		d.y = 0;
		if (_hasTween) t.apply(self);
		self.reset3();
	}

	this.scrollTo = function(y) {
		scroll(y / _ratio);
	};

	this.scrollBy = function(y) {
		scroll((s.getDimensions().y + y) / _ratio);
	};

	this.swapContent = function(n) {
		var d = s.getDimensions
		s.swapContent(n, d.vwidth, d.vheight);
		initialize();
	};

	this.disable = function() {
		this.disabled = true;
		o.className = o.className.replace(/Scrollbar\-Disabled/, "");
		o.className += "Scrollbar-Disabled";
	};

	this.enable = function() {
		this.disabled = false;
		o.className = o.className.replace(/Scrollbar\-Disabled/, "");
	};

	this.getContent = function() {
		return s.getContent();
	};

	this.getComponents = function() {
		return _components;
	};

	this.getDimensions = function() {
		var d = s.getDimensions();
		d.trackHeight = _dimensions.trackHeight;
		d.handleHeight = _dimensions.handleHeight;
		d.handleY = _dimensions.y;

		return d;
	};

	initialize();
};