Applescript "go to" command or pull variables from script?

Question

Is there a "go to line" command in Applescript?  I want to be able to create a dialog box to jump back to the previous box if a mistake was made.  I don't want to do a repeat because that will cause multipule chained repeats and it won't work.  I tried creating seperate scripts and that works fine for jumping around within the program.  But the variables get lost when a new script is ran.  is there a way to bring variables from other scripts into one script?

Answer 1

This is what I have right now.  as you can see there are 3 variables that carry the needed info.  U
ltimatley I'd like to have about 8 variables, all with different info. 
I can do a repeat for each one until something is entered, but I cant do a back command for each entry. 
That's the purpose for the "run 'script'" line in each section.  I'd have to do a repeat inside of a repeat and then overlapping repeats. 
It won't let me do overlapping repeats.  what's the solution?
run script fn
script fn
          set first_name to ""
          set fName to display dialog "first name" default answer "" buttons {"cancel", "next"} default button "next"
          set first_name to text returned of fName
          if first_name = "" then
  run fn
          end if
end script
-- Last Name
run script ln
script ln
          set last_name to ""
          set lName to display dialog "last name" default answer "" buttons {"back", "cancel", "next"} default button "next"
          if button returned of lName = "next" then
                    set last_name to text returned of lName
          else if button returned of lName = "back" then
  run fn
          end if
          if last_name = "" then
                    run ln
          end if
end script
-- street number
run script sn
script sn
          set s_num to ""
          set sNum to display dialog "street number" default answer "" buttons {"back", "cancel", "next"} default button "next"
          if button returned of sNum = "next" then
                    set s_num to text returned of sNum
          else if button returned of sNum = "back" then
                    run ln
          end if
          if s_num = "" then
                    run sn
          end if
end script
-- ready steady write!
display dialog first_name & last_name & s_num