ScriptUI run script from dialog button

I searched over all Adobe forums for script like yours, so to replace (without RegExp) just single character inside of text file.

But I found one problem I don't know whether there is a tweak for. Namely following script replace not only found character, but length of characters starting from looked for character, so if content of text file is: 0123456789

And I want to replace number 5 for letter 'A' there is no problem, I'm getting: 01234A6789

But if I like to change that for 'ABC' I'm getting 01234ABC89 (instead of 01234ABC6789)

Can anyone help me to change this script it worked the way I need:

fle = File('~/desktop/Nums.txt')
fle.open('e'), i = 0; while(!fle.eof) {
     fle.seek(i); if (fle.readch(i) == '5')
     fle.seek(i), fle.write('ABC'); i++
}
fle.close()

Thanks Gotterman, but the issue I was having was that the dialogs I was opening were not being created by me.  They were more like OS generated windows.  So I am not able to give the window a name, or the input field a name in order to reference it.

Peters response was actually correct, although I did have to open the folder dialog a bit differently to get it to work.  I had to use a style that I got from Jongware in a previous thread, but the concept that Peter showed in the last post pointed me in the right direction. 

I just have one more piece to figure out, how I am going to pass the variables to another script, but I think that is something i will have to work out on my own.

For anyone who is curious, here is the code I came up, modifying and combining some of Peters examples from the book plus the help he gave me in this thread.  The alert after closing the dialog is just for testing to show that the values are being held by the variables so I can use them else where.

function mySnippet(){    

//<fragment>   

#target indesign;

#targetengine "session";

var w2 = new Window("palette", "Window 2", undefined, {resizeable: true});

var e2 = w2.add ("edittext"); e2.characters = 30;

var e3 = w2.add ("edittext"); e3.characters = 30;

var f2 = w2.add ("button", undefined,"Browse XML");              

var f3 = w2.add ("button", undefined,"Browse Folder");              

var f4 = w2.add ("button",undefined,"SAVE AND RUN");              

var tf              

var tfo                

f2.onClick = function()                {               

tf = File.openDialog("Select your XML File","*.xml");                    

if (tf != null)                    

{                        

e2.text = tf;                    

}

}                

f3.onClick = function()                {              

var tfol = new Folder("~/My Documents")               

tfo = tfol.selectDlg("Get Folder");                    

if (tfo != null)                    

{                        

e3.text = tfo;                    

}

}                         

f4.onClick = function()               

{                    

w2.close();                   

alert ("xml value: " + tf  + "\nfolder value: " + tfo);                

}  

w2.show();    

//</fragment>

}

Thanks for the reply Peter.  I looked in the section you suggested, and see an example of the onClick, but i am still at a loss as to use it to call another script.  My latest attempts was something like this...

var f2 = w2.add ("button", undefined,"Remove Menu");

f2.onClick = function()

{

var f = File('C:\Users\me\AppData\Roaming\Adobe\InDesign\Version 7.5\en_US\Scripts\Scripts Panel\Scripts\MenuTest_1.jsx');

$.evalFile(f);

}

but it doesn't appear to do anything.  I am not getting any error messages or any indication that anything is wrong, it just doesn't seem to do anything at all.

Am I on the right track, and do you see anything obvious that would not cause it to work, or am I going in a completely wrong direction.