Laptop audio to five earphones

I don't know much about electronics but has quite a lot of experience with microcontrollers(Picaxes and BOEs), beginner inputs & outputs and soldering.

Problem:

In 7 days(Aug25) I am going camping with a few friends and I am in charge with Entertainment part(i.e. Movies). I have my laptop and I am planning to connect FIVE 3.5mm earphones to its audio. Can I build this amplifier and just change the speaker to five 3.5mm female? My last resort would be making one input to five output splitter - is this a bad idea or is this a good short cut? Any downside?

Preferences:

 - I really want to run 5 pairs of earphones/headphones - I know how loud it is inside a tent while its pouring outside.

 - Run in 2-6AA batteries.

 - I have a small radio and a walkman that I could scavenge from or please inform me of other devices.

 - I have 2-4 speaker from an old surround sound if this is a better way to go.

 

Thank you very much for any help! - NOX