blaze VGA adaptor help needed..

hi,
just got a blaze VGA adaptor so i can run my ps2 through my monitor, and i realise that i didnt think about how i was going to get sound from it.. it says you can plug speakers in through audio L and audio R, but i only have a pair of speakers that i use for my computer, with just one input to the sound card.. how can i get sound, can someone tell me my options?
thanks alot
Jon

I have one and I really want to know , does it really work? since it cant load any game and seem no support team for this adaptor any more ~~ I cant find any resourse from internet

i have a cosmo vga box its ok apart from obviouse screen size but it does have sound in from pc sound out to speakers which surley they should all have ;)