function verifyCompatibleBrowser() { 
  this.ver=navigator.appVersion 
  this.dom=document.getElementById?1:0 
  this.ie5=(this.ver.indexOf("MSIE 5")>-1 && this.dom)?1:0; 
  this.ie4=(document.all && !this.dom)?1:0; 
  this.ns5=(this.dom && parseInt(this.ver) >= 5) ?1:0; 
  this.ns4=(document.layers && !this.dom)?1:0; 
  this.bw=(this.ie5 || this.ie4 || this.ns4 || this.ns5);
  return this;
 }
  
var bw=new verifyCompatibleBrowser() 
  
var speed=50 
var loop, timer;
var initialised; 
 
function ConstructObject(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.scrollHeight=bw.ns4?this.css.document.height:this.el.offsetHeight 
  this.clipHeight=bw.ns4?this.css.clip.height:this.el.offsetHeight 
  this.up=MoveAreaUp;this.down=MoveAreaDown; 
  this.MoveArea=MoveArea; this.x; this.y; 
  this.obj = obj + "Object"; 
  eval(this.obj + "=this"); 
  return this; 
 }
  
function MoveArea(x,y) { 
  this.x=x;this.y=y; 
  this.css.left=this.x;
  this.css.top=this.y; 
 }
 
function MoveAreaDown(move) { 
	 if(this.y>-this.scrollHeight+objContainer.clipHeight){ 
    this.MoveArea(0,this.y-move); 
    if(loop) setTimeout(this.obj+".down("+move+")",speed); 
	 } 
 }
  
function MoveAreaUp(move) { 
	 if(this.y<0){ 
    this.MoveArea(0,this.y-move); 
    if(loop) setTimeout(this.obj+".up("+move+")",speed); 
	 }
 }
  
function PerformScroll(speed) { 
	 if(initialised) { 
		 loop=true; 
		 if(speed>0) objScroller.down(speed); 
		 else objScroller.up(speed); 
	 }
 }
  
function CeaseScroll() { 
  loop=false 
  if(timer) clearTimeout(timer);
 } 

function InitialiseScrollableArea() { 
  objContainer=new ConstructObject('divContainer'); 
  objScroller=new ConstructObject('divContent','divContainer'); 
  objScroller.MoveArea(0,0); 
  objContainer.css.visibility='visible'; 
  initialised=true; 
}