Wireless connection from laptop to speakers

I am using a laptop with a wireless connection.

In my office upstairs I have a computer with an external speaker system.

Downstairs I am running my laptop from a Linksys wireless attached to an external modem. The Linksys has several phone type jack outlets.

Is there any way I can connect the speakers to the Linksys, and hear my laptop music from them? That is to say, send my laptop music wirelessly through the speakers?

I need to find a way to hear the music which is on my laptop (the preferred faster computer now), through decent speakers, without wires running around the living room where I am using the laptop.

Thank you. Angi