//Written by Nathan Faubion: http://n-son.com
//Use this or edit how you want, just give me
//some credit!
function jsScrollbar (o, s, a, ev) {
	var self = this;
	
	this.reset = function (reset) {
		//Arguments that were passed
		this._parent = o;
		this._src    = s;
		this.auto    = a ? a : false;
		this.eventHandler = ev ? ev : function () {};
		//Component Objects
		this._up   = this._findComponent("Scrollbar-Up", this._parent);
		this._down = this._findComponent("Scrollbar-Down", this._parent);
		this._yTrack  = this._findComponent("Scrollbar-Track", this._parent);
		this._yHandle = this._findComponent("Scrollbar-Handle", this._yTrack);
		//Height and position properties
		this._x = 0;
		this._y = 0;
		this._trackTop = findOffsetTop(this._yTrack);
		this._trackHeight  = this._yTrack.offsetHeight;
		this._handleHeight = this._yHandle.offsetHeight;
		//Misc. variables
		this._scrollDist  = 5;
		this._scrollTimer = null;
		this._selectFunc  = null;
		this._grabPoint   = null;
		this._tempTarget  = null;
		this._tempDistX   = 0;
		this._tempDistY   = 0;
		this._disabled    = false;
		this._ratio = (this._src.totalHeight - this._src.viewableHeight)/(this._trackHeight-2 - this._handleHeight);
		
		this._yHandle.ondragstart  = function () {return false;};
		this._yHandle.onmousedown = function () {return false;};
		this._addEvent(this._src.content, "mousewheel", this._scrollbarWheel);
		this._removeEvent(this._parent, "mousedown", this._scrollbarClick);
		this._addEvent(this._parent, "mousedown", this._scrollbarClick);
		
		this._src.reset();
		with (this._yHandle.style) {
			top  = "0px";
			left = "0px";
		}
		this._moveContent();
		
		if (this._src.totalHeight < this._src.viewableHeight || this._ratio == 0) {
		  this.scrollTo(0,0);
			this._disabled = true;
			this._yHandle.style.visibility = "hidden";
			if (this.auto) this._parent.style.visibility = "hidden";
		} else {
			this._disabled = false;
			this._yHandle.style.visibility = "inherit";
			this._parent.style.visibility  = "inherit";
		}
	};
	this.resizeY = function() {
	  this._trackHeight  = this._yTrack.offsetHeight;
	  this._ratio = (this._src.totalHeight - this._src.viewableHeight)/(this._trackHeight-2 - this._handleHeight);
	  
	  this._y = Math.round(-1 * this._src._y / this._ratio);
	  if(this._y >= this._trackHeight-2 - this._handleHeight)
	  {
	    this._y = this._trackHeight-2 - this._handleHeight;
	    self._moveContent();
	  }
	  try { this._yHandle.style.top = (this._y + "px"); } catch (err) {}
	  
	  if (this._src.totalHeight < this._src.viewableHeight || this._ratio == 0) {
	    this.scrollTo(0,0);
			this._disabled = true;
			this._yHandle.style.visibility = "hidden";
			if (this.auto) this._parent.style.visibility = "hidden";
		} else {
			this._disabled = false;
			this._yHandle.style.visibility = "inherit";
			this._parent.style.visibility  = "inherit";
		}
	}
	this._addEvent = function (o, t, f) {
	  if( t == "mousewheel" && navigator.userAgent.indexOf("Firefox") != -1 )
		{
		  if (o.addEventListener)
      { o.addEventListener('DOMMouseScroll', this._scrollbarWheel2, false); }
    }
		else
		{ 
	    if (o.addEventListener) o.addEventListener(t, f, false);
		  else if (o.attachEvent) o.attachEvent('on'+ t, f);
		  else o['on'+ t] = f;
		}
	};
	this._removeEvent = function (o, t, f) {
		if (o.removeEventListener) o.removeEventListener(t, f, false);
		else if (o.detachEvent) o.detachEvent('on'+ t, f);
		else o['on'+ t] = null;
	};
	this._findComponent = function (c, o) {
		var kids = o.childNodes;
		for (var i = 0; i < kids.length; i++) {
			if (kids[i].className && kids[i].className == c) {
				return kids[i];
			}
		}
	};
	//Thank you, Quirksmode
	function findOffsetTop (o) {
		var t = 0;
		if (o.offsetParent) {
			while (o.offsetParent) {
				t += o.offsetTop;
				o  = o.offsetParent;
			}
		}
		return t;
	};
	this._scrollbarClick = function (e) {
		if (self._disabled) return false;
		
		e = e ? e : event;
		if (!e.target) e.target = e.srcElement;
		
		if (e.target.className.indexOf("Scrollbar-Up") > -1) self._scrollUp(e);
		else if (e.target.className.indexOf("Scrollbar-Down") > -1) self._scrollDown(e);
		else if (e.target.className.indexOf("Scrollbar-Track") > -1) self._scrollTrack(e);
		else if (e.target.className.indexOf("Scrollbar-Handle") > -1) self._scrollHandle(e);
		
		self._tempTarget = e.target;
		self._selectFunc = document.onselectstart;
		document.onselectstart = function () {return false;};
		
		self.eventHandler(e.target, "mousedown");
		self._addEvent(document, "mouseup", self._stopScroll, false);
		
		return false;
	};
	this._scrollbarDrag = function (e) {
	  if(!delayScrollbar)
	  {
	    delayScrollbar = true;
		  e = e ? e : event;
		  var t = parseInt(self._yHandle.style.top);
		  var v = e.clientY + document.body.scrollTop - self._trackTop;
		  with (self._yHandle.style) {
			  if (v >= self._trackHeight - self._handleHeight + self._grabPoint-2)
				  top = self._trackHeight - self._handleHeight-2 +"px";
			  else if (v <= self._grabPoint) top = "0px";
			  else top = v - self._grabPoint +"px";
			  self._y = parseInt(top);
		  }
  		
		  scrollbarfocus = true;
  		
		  self._moveContent();
		  setTimeout ( "delayScrollbar = false;", scrollbarDelay);
		}
	};
	this._scrollbarWheel = function (e) {
	  if(!delayScrollbar)
	  {
	    delayScrollbar = true;
		  e = e ? e : event;
		  var dir = 0;
		  
		  if (e.wheelDelta >= 120) dir = -1;
		  if (e.wheelDelta <= -120) dir = 1;
  		
		  self.scrollBy(0, dir * 20);
		  e.returnValue = false;
		  
		  setTimeout ( "delayScrollbar = false;", 30);
		}
	};
	this._scrollbarWheel2 = function (e) {
	  if(!delayScrollbar)
	  {
	    delayScrollbar = true;
		  e = e ? e : event;
		  var dir = 0;
		  
		  if (e.detail < 0) dir = -1;
		  if (e.detail > -0) dir = 1;
  		
		  self.scrollBy(0, dir * 20);
		  e.returnValue = false;
		  
		  setTimeout ( "delayScrollbar = false;", 30);
		}
	};
	this._startScroll = function (x, y) {
		this._tempDistX = x;
		this._tempDistY = y;
		this._scrollTimer = setInterval(function () {
			self.scrollBy(self._tempDistX, self._tempDistY); 
		}, 40);
	};
	this._stopScroll = function () {
		self._removeEvent(document, "mousemove", self._scrollbarDrag, false);
		self._removeEvent(document, "mouseup", self._stopScroll, false);
		
		if (self._selectFunc) document.onselectstart = self._selectFunc;
		else document.onselectstart = function () { return true; };
		
		if (self._scrollTimer) window.clearInterval(self._scrollTimer);
		self.eventHandler (self._tempTarget, "mouseup");
		
		scrollbarfocus = false;
	};
	this._scrollUp = function (e) {this._startScroll(0, -this._scrollDist);};
	this._scrollDown = function (e) {this._startScroll(0, this._scrollDist);};
	this._scrollTrack = function (e) {
		var curY = e.clientY + document.body.scrollTop;
		this._scroll(0, curY - this._trackTop - this._handleHeight/2);
	};
	this._scrollHandle = function (e) {
		var curY = e.clientY + document.body.scrollTop;
		this._grabPoint = curY - findOffsetTop(this._yHandle);
		this._addEvent(document, "mousemove", this._scrollbarDrag, false);
	};
	this._scroll = function (x, y) {
		if (y > this._trackHeight - this._handleHeight-2) 
			y = this._trackHeight - this._handleHeight-2;
		if (y < 0) y = 0;
		
		this._yHandle.style.top = y +"px";
		this._y = y;
		
		this._moveContent();
	};
	this._moveContent = function () {
		this._src.scrollTo(0, Math.round(this._y * this._ratio));
	};
	
	this.scrollBy = function (x, y) {
		this._scroll(0, (-this._src._y + y)/this._ratio);
	};
	this.scrollTo = function (x, y) {
	  if( this._ratio != 0 )
	  { this._scroll(0, y/this._ratio) };
	};
	this.swapContent = function (o, w, h) {
		this._removeEvent(this._src.content, "mousewheel", this._scrollbarWheel, false);
		this._src.swapContent(o, w, h);
		this.reset();
	};
	
	this.reset();
};