How to put audio on a h.264 file

[Genoskill]

I have this file:
http://img2.pict.com/4c/bf/db/2202978/0/dibujo.jpg
it has no audio.

I want to put this file on it:
http://img2.pict.com/21/9a/6d/2202979/0/dibujo28129.jpg
I don't know if this question is hard to answer or if it's extremly noob, but... how can I join those files without loss video quality?

BTW I have Mediacoder, but i don't know how to do it.

[sneaker_ger]

You can use MKVMergeGUI (http://www.bunkus.org/videotools/mkvtoolnix/win32/mkvtoolnix-unicode-3.0.0-setup.exe) to mux them together. Just start the program, drop both files in it and click "mux". Done.

You may want to compress the audio. You can do a conversion to vorbis (for example) with oggdropXPd (http://www.rarewares.org/dancer/dancer.php?f=235). Just drag and drop the .wav-file and then drop the avi and the new ogg in MKVMergeGUI, then click "mux" and you're done.