Text field length validation in Acrobat 8
 

I really need help on this one.
The problem is quite simple-
I've got many text fields that user has to fill. The thing I can't figure out is how NOT to allow go to next field if the length of current field's value is less than 6 digits. I tried something like this, but I know almost nothing about javascript so it's not working:

var lg = getField("From[0]").value.length;

if(lg<6 && lg>0){

getField("From[0]").setFocus();

}

And I've put this in onBlur event... Could anybody help me?

Re: Text field length validation in Acrobat 8
 

Not my are of expertice but maybe this can help, link