Scrollbar/slider not working in text scroller

programming flash
1

AS I used for a Flash 5 project seems to have a problem when published for Flash Player 7 from MX2004. I would appreciate some expertise in solving this problem. Here is the AS:

onClipEvent (load){

this.loadVariables("text.txt");
scrolling = 0;
frameCounter = 1;
speedFactor = 3;
numLines = 7;
resetOnNewFile = true;

origHeight = scrollbar._height;
origX = scrollbar._x;

refreshRate = 12;
refreshCounter = 0;
refreshlastMaxscroll = 0;
loaded = false;

function refreshScrollBar(){

	daTextBox.scroll = resetOnNewFile ? 1 : Math.min(daTextBox.maxscroll, daTextBox.scroll);
	
	var totalLines = numLines + daTextBox.maxscroll - 1;
	scrollbar._yscale = 100*(numLines)/totalLines;
	deltaHeight = origHeight - scrollbar._height;
	lineHeight = deltaHeight/(daTextBox.maxScroll - 1);	
	updateScrollBarPos(); 
	
}

function updateScrollBarPos(){

	scrollbar._y = lineHeight*(daTextBox.scroll - 1);
}

}

onClipEvent (enterFrame){

if( loaded ){

	if(refreshCounter % refreshRate == 0 && daTextBox.maxscroll != refreshLastMaxScroll){
	
		refreshScrollBar();
		refreshLastMaxScroll = daTextBox.maxscroll;
		refreshCounter = 0;
		
	}
	refreshCounter++;
}

if( frameCounter % speedFactor == 0){

	if( scrolling == "up" && daTextBox.scroll > 1){
		daTextBox.scroll--;
		updateScrollBarPos();
	}
	else if( scrolling == "down" && daTextBox.scroll < daTextBox.maxscroll){
		daTextBox.scroll++;
		updateScrollBarPos();
	}
	frameCounter = 0;
}
frameCounter++;

}

onClipEvent (mouseDown){

if(up.hitTest(_root._xmouse,_root._ymouse)){
	scrolling = "up";
	frameCounter = speedFactor;
	up.gotoAndStop(2);
}
if(down.hitTest(_root._xmouse,_root._ymouse)){
	scrolling = "down";
	frameCounter = speedFactor;
	down.gotoAndStop(2);
}
if(scrollbar.hitTest(_root._xmouse,_root._ymouse)){
	scrollbar.startDrag(0,origX,deltaHeight,origX);
	scrolling = "scrollbar";
}
updateAfterEvent();

}

onClipEvent (mouseUp){

scrolling = 0;
up.gotoAndStop(1);
down.gotoAndStop(1);
stopDrag();

updateAfterEvent();

}

onClipEvent (mouseMove){
if(scrolling == “scrollbar”){
daTextBox.scroll = Math.round((scrollbar._y)/lineHeight + 1);
}
updateAfterEvent();
}

onClipEvent (data){
loaded = true;
}

Thanks,
Gazzer