Changing the cursor position in an input text field and Removing leading numeric zeros

Question

Flash8 - AS2
It's good to be back after all these years and thanks for the faithfull folks like kglad, Ned Murphy, Rothrock and all the others who give so much of themselves to make this forum a success!
My Problem:
I have an input text field that is named in the properties box as 'numberOfKids'.
When the program is executed, and a delete or backspace is pressed the input textfield goes blank
and any calculations that use 'numberOfKids' shows NaN.
I have trapped the NaN and undefined so that a numeric 0 shows up instead of a blank.
There are two problems:
First problem:
  The cursor is to the left of the zero, so the first number inputted by the user is 10x larger than what they want.  0 becomes 10.
Question:  How do I get the cursor to move to the right of the 0?
Second Problem: 
  When I manually move the cursor to the right of the 0 and input a number, say 4, it shows up as 04.
Question 2:  How do I delete the leading numeric zero in the input textfield?
Thanks for the help.
Here's the code I am using:
calculateChildWeight = function () {
if (isNaN(numberOfKids)) {
  numberOfKids = 0;
if ((numberOfKids) == undefined) {
  numberOfKids = 0;
if (numberOfKids>=0 && numberOfKids<=137) {
  numberOfKids = numberOfKids;
} else {
  numberOfKids = 0;
if (isNaN(adjustedChildWeight)) {
  adjustedChildWeight = 0;
if ((adjustedChildWeight)=undefined) {
  adjustedChildWeight = 0;
adjustedChildWeight = Number(numberOfKids*(-100));
//numberOfKids.setSelection(numberOfKids.length, numberOfKids.length);
//if (numberOfKids.length=2 && numberOfKids<10) {
  // remove the first character or leading zero
//  numberOfKids = numberOfKids;

Answer 1

Thanks Rothrock for being so  patient.
I'm lost!
I go back to a brand new flash file to try and implement the textfields as a stand alone test document.  I have lost the concept I think.
I created on the stage of a blank .fla file  4 text fields, 2 input and 2 dynamic.  I gave them an instance name in the properties box.  I use this instance name.text to find the value of the field.  I use the parseInt to put that value into a numeric variable for calculation.  The results are put to the appropriate textfield.
All seems to work except one of my input text fields.   I use the value of this field  to calculate:
revisedValue = parseInt(numberOfKids.text);
revisedValue = revisedValue*(-100);
The problem now is that if the numberic '2' is inputted into numberOfKids, numberOfKids.text shows up as 200 and a trace shows up as '2NaN'.
Flash is logical and consistant, I must conform to it but I'm in the dark.
(( Concerning the forum:  If I click on helpful, which your posts have been in directing me, does that blank out the possibility of selecting the correct answer in the future???))