Help generate maxscript sequent report

MyLog = "c:\\MyBitmapCollector.log"
ini_file = createFile MyLog
ToMyLog = openFile MyLog mode:"at"

Sep = "//============================================\\\\"
format "%\n" sep to:ToMyLog

txt = ""
format "%\n" txt to:ToMyLog

txt = "Total Scene Bitmap : " + (g as string) +" Files"
format "%\n" txt to:ToMyLog

txt = "Total Collected Bitmap : " + (u as string) +" Files"
format "%\n" txt to:ToMyLog

txt = "Total Missing Bitmap : " + (h as string) + " Files"
format "%\n" txt to:ToMyLog

txt = "________________________________________"
format "%\n" txt to:ToMyLog


if ((u=g) ==true )then txtLog= "All file copied without fail" else txtLog= "Theres still missing bitmap that still not copied"
format "%\n" txtLog to:ToMyLog

txt = ""
format "%\n" txt to:ToMyLog

Sep = "\\\\============================================//"
format "%\n" sep to:ToMyLog
close ini_file

Hi everybody, I need help to create sequential report for my script, basicly I already made script, like those above, but it didnt generate sequent report, like I wanted. From script above if you execute it, it should create file c:\\MyBitmapCollector.log and contain report like this in it :

(THIS IS DATA REPORT THAT ALREADY EXIST)

//============================================\\

Total Scene Bitmap : 3 Files
Total Collected Bitmap : 1 Files
Total Missing Bitmap : 2 Files
________________________________________
Theres still missing bitmap that still not copied

\\============================================//

but after execute it again, instead of append new report in my log, it just flush all data in my log. How do I append into below the data report that currently exist in my log ?

Big Thanks
fajar