To program an AVR, one can use the so called DonTronics parallel adapter, which connects to the parallel port of a PC:

Parallel port pin	Pin name	Pin no
2	MOSI	17
4	/Reset	1
5	CLK	19
11	MISO	18
18-25	Ground	10

To program the AVR, you can use a program like Avrdude, wich is downloadable here. Avrdude is a commandline program, to program a hex-file one has to invoke the following lines:

avrdude -P /dev/parport0 -E noreset -e -u -c dt006 -p t2313 -U "flash:w:myfirmware.hex:hex"
avrdude -P /dev/parport0 -u -c dt006 -p t2313 -U "lfuse:w:0xcf:m"               
avrdude -P /dev/parport0 -E noreset -u -c dt006 -p t2313 -U "hfuse:w:0xdf:m"