How do I show multiple images when I hover over different areas with the MouseOver function?

Question

I’ve been working on a flash simulator to show what our Expert Range Finder binocular product would look like. The idea is to hover over an area, or image and it show the range or how far the object is from you.
I have been successful in making it work with the following code below.  Yet I cannot add several "range" images (or symbols) when I hover over a certain area.  Can someone help me with the code?  I looked for hours on the internet and I cannot get it to work.  I am new to Flash but am starting to learn as much as I can.  Any help is appreciated!  Thanks!
Actionscript 3 Code:
img_nv.mask = mask2_mc;
mask2_mc.buttonMode=true;
mask2_mc.addEventListener(MouseEvent.MOUSE_DOWN, onDown);
mask2_mc.addEventListener(MouseEvent.MOUSE_UP, onUp);
function onDown(e:MouseEvent):void{
mask2_mc.startDrag();
function onUp(e:MouseEvent):void{
mask2_mc.stopDrag();

Answer 1

Ned:
I can't thank you enough for your help!  I just have a few questions left if you don't mind.
If you look at the picture, the text shows up in the "tfield" yet there is a weird symbol after "37Y" that I cannot get rid of.  In the code I erased in line 29 " + " zone" " Is that the reason why it is showing a weid symbol?
One more question. I tried placing multiple ranges and text fields and they are not working.  All I did was duplicate the code for the first range and text like below but I am missing something.  Will you kindly help me?
Actionscript Code:
range2.addEventListener(MouseEvent.ROLL_OVER, manageMouseOver, false, 0, true);
range2.addEventListener(MouseEvent.ROLL_OUT, manageMouseOut, false, 0, true);
function manageMouseOver(event:MouseEvent):void{
  tfield2.text = "over "+ event.currentTarget.name + " zone";
function manageMouseOut(event:MouseEvent):void{
tfield2.text = "";
range3.addEventListener(MouseEvent.ROLL_OVER, manageMouseOver, false, 0, true);
range3.addEventListener(MouseEvent.ROLL_OUT, manageMouseOut, false, 0, true);
function manageMouseOver(event:MouseEvent):void{
  tfield3.text = "over "+ event.currentTarget.name + " zone";
function manageMouseOut(event:MouseEvent):void{
  tfield3.text = "";
. . . .and so on for two more ranges and text fields.