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cannot play sound from different sources at the same time with ALSA

this is my problem:
few days ago i was listening to music with beep-media-player (ALSA output plugin) and at the same time, i opened a link in firefox containing a straming video ready to be plaied by mozilla mplayer plug-in
BUT
the video did not start. i tried to stop beep media player and the video started.
i have tried to do the contrary process, playing mplayer and then playing from beep-media-player but i get this error:
control that:
1. you have selected the right output plugin.
2. other programs are not blocking the sound card.
3. your audio card is configured.

My question is:
it is possible to play different sounds at the same time?? if so, please tell me what to do

here is some boring informations:

My kernel configuration

http://rosi84.altervista.org/config-kernel

system debian gnu/linux sarge kernel 2.5.16
alsa version: 1.0.8-7
sound card: integrated i810

thanks

research implementing "dmix" plugin for your card using ~/.asoundrc

YEAH!!
thank you friend, i have foud how to configure it properly in the alsa website.
i added these lines

Code:

    pcm.!default {

        type plug

        slave.pcm "dmixer"

    }



 

    pcm.dmixer  {

        type dmix

        ipc_key 1024

        slave {

            pcm "hw:1,0"

            period_time 0

            period_size 1024

            buffer_size 4096

            rate 44100

        }

        bindings {

            0 0

            1 1

        }

    }

 

    ctl.dmixer {

        type hw

        card 0

    }

and now i can play (using alsa) from different sources without any problem!

bye thank you very much