problemi con scroll

[dadaja]

ho alcune pagine con questo script (vedi sotto) per lo scroll dei contenuti,
pare però che explorer 7 non li visualizzi... come mai?



<script language="Javascript">

function lib_bwcheck(){ //Browsercheck (needed)
this.ver=navigator.appVersion
this.agent=navigator.userAgent
this.dom=document.getElementById?1:0
this.opera5=this.agent.indexOf("Opera 5")>-1
this.ie5=(this.ver.indexOf("MSIE 5")>-1 && this.dom && !this.opera5)?1:0;
this.ie6=(this.ver.indexOf("MSIE 6")>-1 && this.dom && !this.opera5)?1:0;
this.ie4=(document.all && !this.dom && !this.opera5)?1:0;
this.ie=this.ie4||this.ie5||this.ie6
this.mac=this.agent.indexOf("Mac")>-1
this.ns6=(this.dom && parseInt(this.ver) >= 5) ?1:0;
this.ns4=(document.layers && !this.dom)?1:0;
this.bw=(this.ie6 || this.ie5 || this.ie4 || this.ns4 || this.ns6 || this.opera5)
return this
}
var bw=new lib_bwcheck()

//If you want it to move faster you can set this lower, it's the timeout:
var speed = 20

//Sets variables to keep track of what's happening
var loop, timer

//Object constructor
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.e l.offsetHeight
this.up=goUp;this.down=goDown;
this.moveIt=moveIt; this.x=0; this.y=0;
this.obj = obj + "Object"
eval(this.obj + "=this")
return this
}

// A unit of measure that will be added when setting the position of a layer.
var px = bw.ns4||window.opera?"":"px";

function moveIt(x,y){
this.x = x
this.y = y
this.css.left = this.x+px
this.css.top = this.y+px
}

//Makes the object go up
function goDown(move){
if (this.y>-this.scrollHeight+oCont.clipHeight){
this.moveIt(0,this.y-move)
if (loop) setTimeout(this.obj+".down("+move+")",speed)
}
}
//Makes the object go down
function goUp(move){
if (this.y<0){
this.moveIt(0,this.y-move)
if (loop) setTimeout(this.obj+".up("+move+")",speed)
}
}

//Calls the scrolling functions. Also checks whether the page is loaded or not.
function scroll(speed){
if (scrolltextLoaded){
loop = true;
if (speed>0) oScroll.down(speed)
else oScroll.up(speed)
}
}

//Stops the scrolling (called on mouseout)
function noScroll(){
loop = false
if (timer) clearTimeout(timer)
}
//Makes the object
var scrolltextLoaded = false
function scrolltextInit(){
oCont = new makeObj('divScrollTextCont')
oScroll = new makeObj('divText','divScrollTextCont')
oScroll.moveIt(0,0)
oCont.css.visibility = "visible"
scrolltextLoaded = true
}
//Call the init on page load if the browser is ok...
if (bw.bw) onload = scrolltextInit


</script>

[dadaja]

aiuuuuuuuuuuuuuuuuuuutooooooooooooooooooo!!!!!!!!! !!!!!!!!!!!!!!!