Using an STK500 as a standalone Arduino Board

I found this great blog : Minimal Arduino with ATmega8 – todbot blog

An after burnig the atmega8-noxtal i was able to download the 'blink' example.

Now I can not figure out how to download another program. How do you get the STK500 board to start the bootloader again (and not the blink) program ?
Thanks.
-D