ActionScript 1/2 :: Changing The Cursor Position In An Input Text Field And Removing Leading Numeric Zeros?

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.
 
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. 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. How do I delete the leading numeric zero in the input textfield?

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;// }};