Update on my script. Turned it into a setprop handler. Put wouter´s suggestions in. Thanks Wouter!

Usage:

set the changeSize of fld "myField" to 1
set the changeSize of fld "myField" to -1

Script (in card or stack)

setProp changeSize myChange
  if myChange is not a number then
    return "Error: parameter must be a number!"
    exit changeSize
  end if
  if there is no field the target then
    return "Error: Target must be a field!"&&the target
    exit changeSize
  end if
  put the htmlText of the target into theHtml
  if the effective textSize of the target+myChange<8 then
    return "Smallest size reached"
    exit changeSize
  end if
  set the textSize of the target to \
      the effective textSize of the target+myChange
  replace "size="&quote with "size="&numToChar(1500) in theHTML
  set the itemdel to numToChar(1500)
  if the number of items of theHTML<>1 then
    put 0 into testItem
    repeat for each item theItem in theHTML
      add 1 to testItem
      if testItem<>1 then
        put offset(quote,theitem) into counter
        put char 1 to counter-1 of theItem into theSize
        put theSize+myChange into theSize
        if theSize<8 then
          set the textSize of the target to \
              the effective textSize of the target-myChange
          return "Smallest size reached!"
          exit changeSize
        end if
        put theSize into char 1 to counter-1 of theItem
        put quote&theItem after newHTML
      else
        put theItem into newHTML
        next repeat
      end if
    end repeat
    set the htmlText of the target to newHTML
  end if
  put the htmlText of the target
end ChangeSize

Cheers,

Malte_______________________________________________
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