var ns4 = (document.layers)? true:false;
	var ie4 = (document.all)? true:false;
	var dom = (document.getElementById)? true:false;
	
	function GetNS4Object(MyID,MyDocument) {
		var MyObject= eval('MyDocument.'+MyID);
		if (!(MyObject))
	  		for(var i=0;i<MyDocument.layers.length;i++) {
				MyObject = GetNS4Object(MyID,MyDocument.layers[i].document);
				if (MyObject) break;
			}
	  	return MyObject;
	}
	
	function GetObject(MyID) {
		if (dom) return document.getElementById(MyID);
		if (ie4) return document.all[MyID];
		if (ns4) return GetNS4Object(MyID,window.document);
		return 0;
	} 
	
	function GetCSS(MyObject) {
		if (dom || ie4) return MyObject.style;
		else if (ns4) return MyObject;
		else return 0;
	}
	
	function GetHeight(MyObject) { 
		if (dom || ie4) return MyObject.offsetHeight;
		else if (ns4) return MyObject.clip.height;
		else return 0;
	}
	
	function GetWidth(MyObject) { 
		if (dom || ie4) return MyObject.offsetWidth;
		else if (ns4) return MyObject.clip.width;
		else return 0;
	}

	function GetTop(MyObject) { 
		if (dom || ie4) 
		return (MyObject.offsetTop);
		if (ns4) return MyObject.y;
		return 0;
	}

	function GetLeft(MyObject) { 
		if (dom || ie4) return MyObject.offsetLeft;
		if (ns4) return MyObject.x;
		return 0;
	}

	function MoveObject(myX,myY) {
		this.X = myX;
		this.Y = myY;
		this.CSS.left=this.X;
		this.CSS.top=this.Y;
	}

	function MoveObjectUp(mystep) {
		this.Y -= mystep;
		this.CSS.top=this.Y;
	}

	function MoveObjectDown(mystep) {
		this.Y += mystep;
		this.CSS.top=this.Y;
	}

	function CreateObject(DivId,MyObject) {
    	if (MyObject)
			this.Object = MyObject;
		else
    		this.Object = GetObject(DivId);
		if (this.Object) {
			this.CSS = GetCSS(this.Object);
			this.Height = GetHeight(this.Object);
			this.Width = GetWidth(this.Object);
			this.X = GetTop(this.Object);
			this.Y = GetLeft(this.Object);
			this.Move = MoveObject;
			this.Up = MoveObjectUp;
			this.Down = MoveObjectDown;
		}
    	return this;
	}

	function DelTextNode(MyObject) {
		var node = MyObject.firstChild;
		var next;
		while (node) {
			next = node.nextSibling;
			if (node.nodeType == 3)
				MyObject.removeChild(node);
			node = next;
		}
	}

	function CreateChildren(MyObject,HoriSpacer,VertSpacer) {
		var i=0;
		var MyChildren = new Array();
		if (dom) {
			DelTextNode(MyObject);
			for (i=0;i<MyObject.childNodes.length;i++) {
				MyChildren[i] = new CreateObject(0,MyObject.childNodes[i]);
				MyChildren[i].Move(i*HoriSpacer,i*VertSpacer);
			}
			return MyChildren;
		}
		if (ie4) {
			for (i=0;i<MyObject.children.length;i++) {
				MyChildren[i] = new CreateObject(0,MyObject.children(i));
				MyChildren[i].Move(i*HoriSpacer,i*VertSpacer);
			}
			return MyChildren;
		}
		if (ns4) {
			for (i=0;i<MyObject.document.layers.length;i++) {
				MyChildren[i] = new CreateObject(0,MyObject.layers[i]);
				MyChildren[i].Move(i*HoriSpacer,i*VertSpacer);
			}
			return MyChildren;   
		}
	}

	function ScrollUp() {
		var MyInterval = this.Interval1;
		this.stop();
		if (this.Children[this.FirstChildren].Y<-this.threshold) {
			MyInterval = this.Interval2;
			this.Children[this.FirstChildren].Down(this.TotalHeight);
			if (this.FirstChildren<this.Children.length-1) {
				this.FirstChildren++;
				this.threshold += this.Children[this.FirstChildren].Height;
			} else {
				this.FirstChildren = 0;
				this.threshold = this.Children[this.FirstChildren].Height+this.Spacer;
			}
		}
		for (var i=0;i<this.Children.length;i++) {
			this.Children[i].Up(this.Step);    
		}
		this.ProcessId = setTimeout(this.name + '.start()', MyInterval);
	}
  
	function ScrollStop() {
		if (this.ProcessId)
			clearTimeout(this.ProcessId);
		this.ProcessId = null;
	}

	function Box(BoxName, DivId, myStep, myTempo1, myTempo2, mySpacer) {
		this.name     = BoxName;
		this.Step  = myStep ? myStep : 1;
		this.Interval1 = myTempo1 ? myTempo1 : 100;
		this.Interval2 = myTempo2 ? myTempo2 : 100;
		this.Spacer = mySpacer ? mySpacer : 0;
		this.ProcessId	= null;
		this.Container = new CreateObject(DivId);
		this.Children = new CreateChildren(this.Container.Object,0,mySpacer);
		this.FirstChildren = 0;
		this.LastChildren = this.Children.length-1;
		this.threshold = this.Children[0].Height+this.Spacer;
		var myHeight = 0;
		for (var i=0;i<this.Children.length;i++) {
			myHeight += (this.Children[i].Height + this.Spacer);
		}
		this.TotalHeight = myHeight;
		this.Container.visibility = 'visible';
	}
	
	Box.prototype.start = ScrollUp;
	Box.prototype.stop = ScrollStop;