//Browser ueberpruefen ob es auf allen lauft:
function checkBrowser(){
        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 checkBrowser()



//geschwindigkeit:
var speed=20

//variable
var loop, timer

//Object konstruieren
function makeObj(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=goUp;this.down=goDown;
        this.moveIt=moveIt; this.x; this.y;
    this.obj = obj + "Object"
    eval(this.obj + "=this")
    return this
}
function moveIt(x,y){
        this.x=x;this.y=y
        this.css.left=this.x
        this.css.top=this.y
}

//objekt dazu bewegen nach oben zu gehen
function goDown(move){
        if(this.y>-this.scrollHeight+oCont.clipHeight){
                this.moveIt(0,this.y-move)
                        if(loop) setTimeout(this.obj+".down("+move+")",speed)
        }
}
//objekt dazu bewegen nach unten zu gehen
function goUp(move){
        if(this.y<0){
                this.moveIt(0,this.y-move)
                if(loop) setTimeout(this.obj+".up("+move+")",speed)
        }
}


function scroll(speed){
        if(loaded){
                loop=true;
                if(speed>0) oScroll.down(speed)
                else oScroll.up(speed)
        }
}

//scroll stopen
function noScroll(){
        loop=false
        if(timer) clearTimeout(timer)
}
//objekt machen
var loaded;
function scrollInit(){
        oCont=new makeObj('div1')
        oScroll=new makeObj('div2','div1')
        oScroll.moveIt(0,0)
        oCont.css.visibility='visible'
        loaded=true;
}

onload=scrollInit;