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;

//obj1 umschlissende objekt
//obj2 objekt mit dem inhalt
//obj3 objekt mit den scrollpfeilen
function InitialiseScrollableArea(obj1,obj2,obj3){
    objContainer= new ConstructObject(obj1)
    objScroller = new ConstructObject(obj2,obj1)
    objScrollBar= new ConstructObject(obj3)
    objScroller.MoveArea(0,0)
    objContainer.css.visibility='visible'
    initialised=true;
    //wenn inhalt rein passt -> scrollbars verbergen
    if(objScroller.el.offsetHeight < objContainer.el.offsetHeight){
        //alert('drin');
        objScrollBar.css.visibility= (ns4) ? "hide" : "hidden";    
    }else{
        objScrollBar.css.visibility= (ns4) ? "show" : "visible";
    }
}
// end absolutely positioned scrollable area object scripts