Stereo cable voodoo: Connect game console output to computer speakers

I need to connect a game console to a computer speaker system. This requires some cable voodoo.

Specifically I need to connect a Wii (composite RCA plug output - 2 stereo sound, 1 video) console stereo output to my Logitech (3.5 mm male) computer speakers. This is a fairly common problem, Amazon has two different solutions:

2 x RCA Female / 1 x 3.5mm Stereo Female Adapter (CableWholesale)

or

both 3.5mm Stereo Coupler F/F AND 3.5mm Stereo Male To 2X RCA Female Adapter (Cables To Go)

I ordered the second one because I needed a bit more versatility.

Now I'd also like to use my computer with the same speakers. I'm going to try using a headphone splitter in reverse -- so the sound sources will plug into the headphone jacks and the speaker will plug into the input jack. I think it might work ...

PS. The mess of a adapters and cables cost half as much as the Logitech computer stereo system. The profit margin on cables is impressive.

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