Wireless Communication

I want to make some small cheap (possibly from toys) walkie talkies it would also be handy if i could attach some headphones(with inbuilt [eg iphone headphones] or seperate mic)

im hopeing to have signel ~100-500m but anything will do.


Search on Google.  I found simple transmitter instructions on http://sci-toys.com/scitoys/scitoys/radio/am_transmitter.html