When loading the Arduino bootloader you need to set following FUSE bits:

0xFD - Extended
0xDA - High
0xFF - Low
0xFF - Lock

Firmware HEX files are contained within this package:

ATmegaBOOT_168_atmega328.hex - 16MHZ crystal
ATmegaBOOT_168_atmega328_pro_8MHz.hex - 8Mhz crystal

Setting the Bootloader Tool in mikroElektronika compilers

In order to call AT-mini bootloader instead of AVRFlash, follow this procedure:
1. Extract the AVRDUDE.EXE and AVRDUDE.CONF file in some folder (e.g. C:\ATMINI\)
2. Create a new Tool in Tools->Options->Tools with following parameters
   Tool Name: AT mini Board
   File Name: %path to exe%\avrdude.exe
   Parameters: -C "%path to conf%\avrdude.conf" -pm328p -cstk500v1 -P COM8 -b57600 -D -U flash:w:"%HEX_FILE_NAME":i  -q -q
   Shortcut: as preffered (for example SHIFT+F11)