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=50 
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) 
	Check();
    objContainer.css.visibility='visible' 
    initialised=true; 
} 

var ie4=(document.all && !document.getElementByID)? true:false;

var ie5=(navigator.appVersion.indexOf("MSIE")>-1 && document.getElementById)? true:false;

var nn4=(document.layers && !document.getElementById)? true:false;

var nn5=(parseInt(navigator.appVersion)>=5 && document.getElementById)? true:false;


function Check(){ 
	if(objContainer.clipHeight-objScroller.scrollHeight<0){
		show('divDownControl',true);
		show('divUpControl',true);
	}
	//alert(String(parseInt(objContainer.clipHeight-objScroller.scrollHeight)));
} 

function show(divid, showhide) {
	if(nn5 || ie5) { var main = document.getElementById(divid);
		(showhide)? main.style.visibility = "visible" : main.style.visibility = "hidden"; }
	else if(nn4) {
        (showhide)?document.layers[divId].visibility = "show":document.layers[divId].visibility = "hide"; }
    else if(ie4) {
        (showhide)?document.all[divId].style.visibility = "visible":document.all[divId].style.visibility = "hidden"; }
    }