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;
}

bw = new verifyCompatibleBrowser();


var speed=40;
var loop, timer;

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)
}

var initialised;

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