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=10;
 
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;
}