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got it...there was 1 small typo in that script. its the last line it should be: TextField1.font.size = newSizeInt + "pt";
I know thats what you meant...your comments in the scripts were really helpful and explained your method...Thanks heaps!
So just to wrap it up again, this is code that I am using and it works:
/This code is for the "+" button
// get font size
var currentSize = TextField1.font.size;
// get location of the "pt" string
var ptPlace = currentSize.indexOf("pt");
// get the part of the string that is just numbers
var currentSizeInt = currentSize.substr(0,ptPlace);
// parse that new string as an integer and add 1
var newSizeInt = parseInt(currentSizeInt,10)+1;
// set that as the new font size ( adding the "pt" back on)
TextField1.font.size = newSizeInt + "pt";
Thanks again Malcolm!