/**********************************************************************************   
PageScroll 
*   Copyright (C) 2001 <a href="/dhtmlcentral/thomas_brattli.asp">Thomas Brattli</a>
*   This script was released at DHTMLCentral.com
*   Visit for more great scripts!
*   This may be used and changed freely as long as this msg is intact!
*   We will also appreciate any links you could give us.
*
*   Made by <a href="/dhtmlcentral/thomas_brattli.asp">Thomas Brattli</a> 
*********************************************************************************/

function lib_bwcheck(){ //Browsercheck (needed)
  this.ver=navigator.appVersion
  this.agent=navigator.userAgent
  this.dom=document.getElementById?1:0
  this.opera5=this.agent.indexOf("Opera 5")>-1
  this.ie5=(this.ver.indexOf("MSIE 5")>-1 && this.dom && !this.opera5)?1:0; 
  this.ie6=(this.ver.indexOf("MSIE 6")>-1 && this.dom && !this.opera5)?1:0;
  this.ie4=(document.all && !this.dom && !this.opera5)?1:0;
  this.ie=this.ie4||this.ie5||this.ie6
  this.mac=this.agent.indexOf("Mac")>-1
  this.ns6=(this.dom && parseInt(this.ver) >= 5) ?1:0; 
  this.ns4=(document.layers && !this.dom)?1:0;
  this.bw=(this.ie6 || this.ie5 || this.ie4 || this.ns4 || this.ns6 || this.opera5)
  return this
}
var bw=new lib_bwcheck()


/*********************************************************************************
These are the variables you have to set:
*********************************************************************************/

//The speed of the timeout between each scroll.
timSpeed = 50

//The height of the container (change this when it scrolls to much or to little)
contHeight = 100

/*********************************************************************************
This is the object constructor function, which applies 
methods and properties to the Cross-browser layer object
*********************************************************************************/
function makeScrollObj(obj,nest){
  nest=(!nest) ? "":'document.'+nest+'.'    
  this.el=bw.dom?document.getElementById(obj):bw.ie4?document.all[obj]:bw.ns4?eval(nest+'document.'+obj):0;
    this.css=bw.dom?document.getElementById(obj).style:bw.ie4?document.all[obj].style:bw.ns4?eval(nest+'document.'+obj):0;    
  this.height=bw.ns4?this.css.document.height:this.el.offsetHeight
  this.top=b_gettop
  return this
}

// A unit of measure that will be added when setting the position of a layer.
var px = bw.ns4||window.opera?"":"px";

//Getting the top for the top method
function b_gettop(){
  var gleft=(bw.ns4 || bw.ns6)?parseInt(this.css.top):eval(this.css.pixelTop);
  return gleft;
}
//Variables
var scrollTim = 1;
var active = 0;
/*********************************************************************************
The scroll function. Checks what way to scroll and checks if the
layer is not already on top or bottom.
*********************************************************************************/
function scroll(speed){
  clearTimeout(scrollTim)
  way = speed>0?1:0
  if ((!way && oScroll[active].top()>-oScroll[active].height+contHeight) || (oScroll[active].top()<0 && way)){
    oScroll[active].css.top = (oScroll[active].top()+speed)+px
    scrollTim = setTimeout("scroll("+speed+")",timSpeed)
  }
}
//Clears the timeout so the scroll stops, this is called onmouseout.
function noScroll(){
  clearTimeout(scrollTim)
}
/*********************************************************************************
Changes the active layer. Hides the one that's visible and
shows the "new" one. Also set's the new layers top to
0 so it starts at top.
*********************************************************************************/
function changeActive(num){
  oScroll[active].css.visibility = "hidden"
  active = num
  oScroll[active].css.top = 0+px
  oScroll[active].css.visibility = "visible"
}
/*********************************************************************************
Initilizes the page, makes a oScroll Array and calls the object constructor.
Here you can add as many scrollObjects as you want
*********************************************************************************/
function scrollInit(){
  oScroll = new Array()
  
  // You can add and remove scrollObjects here.
  oScroll[0] = new makeScrollObj('divScroll1','divCont')
/*
  oScroll[1] = new makeScrollObj('divScroll2','divCont')
  oScroll[2] = new makeScrollObj('divScroll3','divCont')
  oScroll[3] = new makeScrollObj('divScroll4','divCont')
  */
  oScroll[0].css.left = 0+px
  oScroll[0].css.top = 0+px
  oScroll[0].css.visibility = "visible"
  oControl = new makeScrollObj('divControl')
  oControl.css.visibility = "visible"
}