var ns4 = (document.layers)? true:false;   			//NS 4
var ie4 = (document.all)? true:false;   				//IE 4
var dom = (document.getElementById)? true:false;   //DOM

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=parseInt(this.X)+"px";
  this.CSS.top=parseInt(this.Y)+"px";
}

function MoveObjectUp(mystep){
  this.Y -= mystep;
  this.CSS.top=parseInt(this.Y)+"px";
}

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

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;
  }
}
var i_test = 0;
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;