A thing to convert iphone 3/4/4s made appliances to be able to use for an iphone 5?

For example I have a speaker that you can plug into a dock made for iPhone 4/4s but I recently got an iPhone 5 and I don't really wanna buy a whole new speaker made specially for an iphone 5 (cause the plug in charger place is different).Is there such thing as where one side i can put it onto the speaker dock and the other side I'll be able to put into an iPhone 5? I've seen one before but i don't know what it's called.

No such phone called the iPhone 3. 3G or 3GS.

Yes there's. 30-pin to Lightning adaptor
http://store.apple.com/...in-adapter

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