ActionScript 2.0 :: Incrementing A String Variable

I basically have a text file with a username variable that assigns usernames to username1, username2, and so on. I would like to create a loop that checks to see if that username was created and if it was a conditional statement will follow. The problem I have is I want to do a loop with a counter(var i) and increment that counter in the loop and concat that with loginName to input that into a dynamic textfield labeled loginName1. (Actionscript 2)[code]I am using loadvars to load 2 text files, one has username and ip(username1 = blahblah ipaddress1 = blahblah and so on), the second file has an array that has ipaddress and data usage passed in an array. i want to check how many usernames there are and check the ipaddress of that username against the other file containing ipaddresses and usage.) I have everything setup, but im running into issues when writing a loop to check for username1, username2, and so on.