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('ScrollContainer');
    objScroller=new ConstructObject('ScrollContent','ScrollContainer');
    objScroller.MoveArea(0,0);
    objContainer.css.visibility='visible';
    initialised=true;
}